517 The Princess Dowry

Blair thinks Cyrus  may have found a potential loophole in her prenup. Chuck and Georgina partner up in a scheme, but it has an unpredictable outcome. Meanwhile, a family crisis brings William van der Woodsen back to the Upper East Side.

Joanie Madden - Boat to Bofin

The Cranberries - Dreams

Black 47 - Izzy's Irish Rose

Among Savages - New York City

Black 47 -  New York, NY 10009

Charlotte Gainsbourg - Paradisco

The Pogues - Sally Maclennane

Wye Oak - Strangers

Joanie Madden - The Cat's Meow

M83 - We Own The Sky

XOXO

516 Cross Rhodes

Dan feels honored when he learns that Upright Citizen's Brigade is performing excerpts from his book, Inside. Blair tries to prove Serena's suspicions wrong in order to save their friendship. On her way out of town, Ivy ends up on a collision course with the van der Woodsens.

Little Comets - Dancing Song

Feist - Graveyard

Jet Horns (AKA Jon Von Letscher) - Oscar Enzina

XOXO

515 Crazy, Cupid, Love

It's Valentine's Day on the Upper East Side and Blair can't resist playing cupid for someone she loves. Georgina is intent on stirring up more drama, so she decides to crash Nate's Valentine's Day party. Meanwhile, Serena is shocked by something she witnesses at the party.

The Kills - Baby Says

St. Vincent - Cheerleader

Free Blood - Cleaning House

St. Vincent - Cruel

Will.i.am - I Got It From My Mama

Tag Team - Let's Get This Party Started Right

Kina Grannis - The One You Say Goodnight To
The Virgins - Rich Girls
St. Vincent - The Party
Kina Grannis - Valentine

XOXO

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