At brunch, Blair and Serena talk about how Serena's famous because Gossip Girl broke the news that she got arrested.
Serena is ready to graduate so she can finally get away from Gossip Girl, who has plagued her more than anyone else.
Blair asks how exactly Chuck said, "I love her."
S says this shouldn't be news to her, and B asks if S has even told Chuck that she and Nate broke up, and when S says no, a shocked B rushes her out the door to do just that!
Pre-graduation, Vanessa walks up to Nate and they catch up in a friendly way. He's starting his internship soon, his grandfather and mother are on speaking terms again, he and Blair broke up, and he apologizes for how horribly he handled things.
She thanks him for all that stuff forever ago that guided her toward NYU, and Nate then invites V and D to his post-graduation party.
Jenny and Eric celebrate that graduation means the end of the mean girls, just as the girls walk up and ask if she wants to "throw her hat in the ring" for Queen.
J says there should be no queen next year just as Blair walks up and says her minions don't get to choose the next queen - she does.
She struts away, and Penelope tells Jenny that they don't listen to Blair anymore, so if she wants to be queen, she should show up to Nate's party with the biggest piece of gossip, and she'll get it.
"Coronation" happens at midnight.
J's competition: freshman Emma Boardman, the girl whose mother interviewed Blair and Serena for Yale, and who blackmailed B into helping her lose her virginity.
J thinks she can beat the system from inside the system.
Everyone is in robes, waiting for commencement to begin. Blair walks up to Chuck and tells him how great she's doing, but she could be better. She's wondering if he heard that she... is so happy high school is over!
She chickens out as the kids line up for graduation.
Rufus and Jenny walk in and sit right next to Lily and Eric, to his dismay, as Rufus remembers that they reserved their seats together at some point.
Cyrus and Eleanor sit right behind them, and start yapping about what a great couple they make and how they need to get married. Lily tells them that they used to be headed that way, but aren't anymore.
The students file in for commencement, and the headmistress addresses the crowd as B tells S that she chickened out with Chuck.
S says it's okay, they're all moving on. In the middle of celebrating their new beginning, Gossip Girl sends her final, wicked blast:
"Not so fast. You're not graduating until I give you my diplomas. Mine are labels, and labels stick. Nate Archibald: Class whore. Dan Humphrey: The ultimate insider. Chuck Bass: Coward. Blair Waldorf: Weakling. And as for Serena van der Woodsen, after today, you are officially irrelevant. Congratulations, everyone. You deserve it."
Everyone is too stunned by this blast to do stand as graduates typically do at the end. Serena vows right then that Gossip Girl is going down.
At a post-graduation brunch, Serena pleads to the mean girls to help her take down Gossip Girl, but they're too scared. Blair, Chuck, Nate, and Serena will have to take her on by themselves.
Rufus apologizes to Lily, and she asks for which part: the pre-graduation squabble, or the fact that he no longer wants to marry her? She says they both made mistakes and need to move forward, then leaves.
Looking to do some damage control, Nate approaches his grandfather and tells him he had an affair with an older woman last summer, and she was married at the time ... AND she paid him. The Grandfather promises to protect Nate if it ever comes out, even if he is a little surprised.
Chuck asks Nate where Blair is, and Nate tells Chuck they broke up.
S asks for D and V's help with "taking down" Gossip Girl.
D says high school is over, and they all need to move on. S says they're all still friends, and should defend each other... D hesitantly says they won't stay friends after this. Upset, S tells him to "have a good life."
The gang determines that since GG blasts twice as much about Constance and St. Jude's as any other school, either goes to or used to go to Constance.
Chuck decides she's probably their age, as the blasts all started when they began high school. They scour Facebook for possibilities, but S devises a plan: since the whole class is at the post-graduation party, she sends a text to Gossip Girl, and Chuck yells to get the room quiet.
Someone's phone beeps... it's Jonathan!
Chuck grabs the phone and throws it to Serena, revealing her text. Jonathan is NOT Gossip Girl, it turns out. One day he "got bored" and hacked GG's server, so now he and Eric have access to every email she gets.
They peruse all the emails Gossip Girl gets that she does NOT blast, and their "theory" is that either she can't substantiate some of them or she likes to wait until the perfect moment for maximum damage.
J shows E the perfect piece of dirt that will get her the crown so she can "abolish the monarchy forever." We can't see what it is yet.
Rufus tells Dan he should go to that graduation party, as reluctant as he is to do so, so Dan does. Rufus calls Lily just as she heads over to his house with a six-pack and pot. She got that from Chuck, obvs.
She felt old (because she is old), and she wanted to do something young and crazy with Rufus.
Eleanor helps Blair get dressed for the party, and B says she's dressing for someone she hopes will love her in the way Cyrus loves Eleanor.
Blair confesses that Chuck has not yet said he loves her back. Eleanor hugs B and says, "Don't let him get away with it."
Drunk Nelly Yuki thrashes around Nate's party and heads over to Dan to tell him something she's always kept inside... then sees Serena and bolts.
Jenny goes up to Blair and tells her Gossip Girl knows.
Knows what? Blair brushes her off, but Jenny says "...about New Years."
Jenny thought she'd want to know that she's going to give the juice to the mean girls in exchange for keys to the kingdom. Jenny also tells Blair she needs to wake up because she's not queen anymore.
B says J should shut her mouth because she doesn't have what it takes to be queen. Jenny heads over to the girls and tells her that her gossip is too juicy to wait for midnight.
Blair approaches Chuck and takes him into a room. She asks what he thinks about her coat, and takes it off. "And now?" She asks about her headband, and then her stockings, and her dress... as she takes them all off.
"How do you feel about me?" she asks, leaning over him. "I..." Just then, they get a Gossip Girl blast:
"Serena just couldn't leave well enough alone. Since she had to find out the truth about me, I'm going to tell you the truth about everyone. Every gossip bomb I've got is about to drop, and if you've got a problem with that, take it up with her. Ever wonder why Miss Carr left town? It's because Dan Humphrey had sex with her during the school play..."
GG keeps going, spilling about Jenny's PG-13 photo shoot (Nate was there), Dan going to jail, Blair and Jack Bass, and Chuck and Vanessa.
Chuck and Blair confront each other about their mutual scandals, while Jenny and Dan confront each other as well, and everyone turns on Serena in exactly the way that Gossip Girl wanted.
Blair attacks Serena for declaring war on GG. Dan defends Serena, and then Blair attacks him for holding true to his label as the ultimate insider: getting into Yale, the New Yorker, the school play, and Serena.
Penelope asks J what she wanted to tell her, but it doesn't matter now.
Blair finds Chuck and she says he's not mad at her about Jack, just like she's not mad at him about Vanessa. They're just doing what they always have, pushing each other away, and she won't do it anymore.
She asks why he can't tell her that he loves her. Is he really a coward? She holds his face and tells him she loves him. She tells him to tell her the same, so all the gossip and hurt will have been for something.
Chuck looks at her and says, "Maybe it was, but it's not anymore."
He leaves. Blair cries.
Lily and Rufus are stoned out of their minds while they reminisce about the good old days. They talk and talk and talk, and eventually Rufus proposes to Lily with a wrapped up old concert bracelet.
She says yes. They kiss.
Nate finds Serena and tries to comfort her. Serena is still worried that she will have no friends after this. She decides to text Gossip Girl, saying to meet her at the Oak Room in an hour or she will tell reveal GG's identity.
Serena has no idea who she is, "but she doesn't know that."
Blair confronts Jenny in the bathroom and tells her that she told Chuck she loved him (again), and he didn't say it back (again).
With this info she's giving her a chance to be queen, but Jenny doesn't want it. Blair lectures Jenny about not being such a softie.
B tells her that for what it's worth, she chooses J. She's her queen. Aww. Jenny thanks her. Just then, Blair gets a text...
Serena and Nate wait at the Oak Room for Gossip Girl, and Dan shows up. He's not Gossip Girl, he just wanted to find Serena. He asks what's going on with her, and she says she doesn't want to be irrelevant.
He comforts her that she made him what he is.
Blair walks in, and Nate thinks she's Gossip Girl, and then Jenny walks in. And so do the mean girls, Vanessa, Eric, and... tons of others.
They all get a text:
"You wanted to meet Gossip Girl? Well, look around. I'm nothing without you. And while most high school friendships fade, it's my hope that what happened today will bond you forever. Now that all my secrets are out, you have a clean slate. Until college. Congratulations, I'm coming with you."
So Gossip Girl's identity remains a mystery, but all seems well right now.
Blair apologizes to Serena, and tells S that it's officially over between her and Chuck. But she's gonna be strong. Chuck watches her from outside, and Blair sees him as he walks away.
ONE WEEK LATER
Rufus gives Lily a real engagement ring and they kiss. Eric gets a waffle iron he's "dreamed about," Jenny has a cryptic meeting with Blair, and Serena consults Blair on outfits to pack for her summer in Europe.
They talk (again) about getting a fresh start. Blair gives S a present: a framed mug shot. S asks if she'll come to Europe too, but Blair says she needs to spend the summer contemplating the failure of her life.
In a coffee shop, Dan is already waxing nostalgic about high school. Nate walks up and says the deputy mayor tried to get in his pants on his first day, so he quit. Now he wants to go backpacking in Europe with Vanessa.
She says it's too late, she's already going with... THAT GUY! That random guy over there. The kid rolls with it, but says, "Yeah, we're going to have a great time, Melissa and I."
She says thanks for trying, and the kid sits down with his book. Nate tells Vanessa they can just go as friends (unless they drink too much), and she agrees.
The kid looks at Dan and they start up a conversation, learning they'll both be at NYU in the fall. His name is Scott. Dan is polite but leaves.
Blair and Jenny invade Penelope's all-too-literal coronation of Emma. Blair steals the gem-encrusted headband and says she's taking back her power with a final blow: GG is now blasting out all those secrets Jenny kept when she was protecting Nelly Yuki, and now the world knows them.
There's a new winner, and it's Little J.
Jenny unenthusiastically puts on the headband. Penelope scoffs at the new Brooklyn queen, but since Jenny's dad is now marrying Lily, that makes her richer than all of them, says Blair.
Blair shoos Emma out of the way, and Jenny sits down and begins the major policy changes of her new administration: "Starting next year, no more headbands. Except for this one."
In the coffee shop, Scott calls his mom and says he's already met some cool people in... Portland. He looks at a news article on Lily in front of him and says, "I think I'm gonna love it."
Dan gets a call from a blocked number and it's ... Georgina! She says that his money should be back in his account now, so he can go to Yale.
He says he's actually going to NYU, and she says, "Great. I'll see you next year." She hangs up.
Georgina's standing at the Student Services counter at NYU and hands over her paperwork, and then requests her "best friend" as her new roommate:
Serena packs up her car to hurry up and go to Europe already, and Carter Baizen walks up. He says he found something she wanted in Santorini, only now it's in Fiji: he hands her a report from a P.I.
She gasps: "You found my father?"
Serena tells Carter to get in the car, and they drive off.
Blair walks down the street and finds Chuck waiting for her with a bouquet and a gift. "Why aren't you in Europe?" He says he was in Paris... and Germany... to get her favorite macaroons and stockings.
He came back to tell her that she was right.
The following exchange closes out the season:
Chuck: I was a coward running away again. But everywhere I went, you caught up with me. So I had to come back.
Blair: I want to believe you, but I can't. You've hurt me too many times.
Chuck: Then believe me this time.
Blair: That's it?
Chuck: [pauses] I love you, too. (they kiss)
Blair: Can you say it twice? (laughs) No, I'm serious, say it twice.
Chuck: I love you, I love you, I love you. (kissing)
XOXO, Gossip Girl.
(Source: TV Fanatic)