514 The Backup Dan

Blair must make a difficult decision about her future, the consequences of which could hurt those she loves most. Serena takes the blame for an incident with Gossip Girl in order to protect someone she loves. Georgina smells the scent of scandal and decides to follow its trail.

The Big Pink - Future This

Madonna - Like A Virgin

In Waves - New York City

Joanna James - Try

M83 - Wait

The Temporary Thing - War

XOXO

513 G.G.

The much-anticipated 100th episode will open with a musical dream sequence featuring Serena, Blair and all the men in their lives. Also, while Chuck wrestles with the reality that Blair is about to walk down the aisle with Prince Louis, the return of Georgina Sparks might make the royal affair a royal disaster.

Marlyn Monroe - Diamonds Are A Girl's Best Friend

Vitamin String Quartet - Never Tear Us Apart

Grouplove - Slow

Wolf Gang - Suego Faults

Vitamin String Quartet -We Belong

The Kooks - Young Folks

Beethoven - Rondo In C Major, Op. 51
Jon Hasting - Endless Summer 

XOXO

512 Father AndThe Bride

Blair prepares to celebrate her upcoming royal wedding with a bachelorette party, but others scheme behind her back to make this a night to remember. After discovering the truth behind Chuck and Blair's car accident, Nate joins forces with a surprising ally to gather the evidence. Serena and Dan pretend to be dating again to protect someone close to them.

The Naked and Famous - Bells

Hollywood Holt - Brains

The Joy Formidable - Cradle (Fang Island Remix)

LMFAO - Party Rock Anthem

LMFAO - Sexy and I Know It

The Lost Patrol - The Road is Long
James Vincent McMorrow - Wicked Games
Two Door Cinema Club - New House

XOXO

511 The End of the Affair?

Through a series of emotional flashbacks, Blair reveals to Serena what really happened in the aftermath of her tragic car accident with Chuck. Meanwhile, Nate discovers information about the accident that suggests possible foul play. Lily is worried by Charlie's long absence and decides to hire a private detective to track her down.

My Gold Mask - All Up In The Air

All Mankind - Break The Spell

Dum Dum Girls - Coming Down

Zee Avi - Concrete Wall

M83 - Outro

Michael Nyman - The End of the Affair

James Vincent McMorrow - Wicked Game

Helene Smith - Willing and Able

XOXO

510 Riding In Town Cars With Boys

Lily throws Charlie a party to officially introduce her to New York society. Meanwhile, Charlie's ex-boyfriend, Max, throws a wrench into Charlie's future as an Upper East Side princess. Dan decides it may be time to tell Blair the truth about his feelings for her.

Ladytron - Ace of Hz

The Joy Formidable - Anemone

Patrick Joseph - Arsonist Blues

Florence + The Machine - Heartlines

Ladytron - Mirage

JoAnna James - You Could Never Be Mine

Lover Lover - Young Free

XOXO

509 Rhodes To Perdition

Lily, Charlie and Serena eagerly anticipate the Studio 54 party being thrown in CeCe's honor. Nate takes on a new role at the Spectator, but his first big story turns out to be about someone he knows all too well. Blair turns to an unlikely person for help.

Fitz & The Tantrums - Breakin' The Chains of Love

Donna Summers - I Feel Love

Kool & The Gang - Ladies Night

Chic - Le Freak

All Mankind - Simple Desire

Still Corners - The Twilight Hour

CSS - You Could Have It All

XOXO

508 All The Pretty Sources

Serena is hard at work planning a dream bridal shower for Blair, but it should come as no surprise that Serena has to plant some false information about the shower in order to keep Blair from finding out all the details. Chuck and Dan decide to spend the day together to distract themselves from the fact that they didn't make the invite list for Blair's shower. Nate and Serena find a silver bullet in Diana's war against Gossip Girl, but struggle about whether to use it or not.

Francisco The Man - Me and My Brother

Gotye - Somebody I Used To Know Feat. Kimbra

Zee Avi - Swell Window

Feist - The Bad in Each Other

Slow Club - Two Cousins

Givers - Up Up Up

Gerhard Narholz - Cha Cha Nova

XOXO