422 The Wrong Goodbye

Season four wraps up with an explosive finale, including the return of Georgina Sparks and Constance Billard mean girls Kati and Is, a cameo by "Gossip Girl" author Cecily von Ziegesar, a performance by Airborne Toxic Event and, oh yeah, a few very juicy cliffhangers.

The Airborne Toxic Event - All For A Woman

The Airborne Toxic Event - Changing

The Duke Spirit - Cherry Tree

Badly Drawn Boy - In Safe Hands

Oh Land - Perfection

Adele - Rolling In The Deep

The Pierces - Space + Time

Figurines - The Great Unknown

XOXO

421 Shattered Bass

Charlie is finally starting to feel less like a fish-out-of-water with Serena and her friends, but complications present themselves when Charlie is invited to attend the Constance Billard alumni fundraiser. On the road to "happily ever after," Blair finds herself torn between the men in her life. Jack Bass' return to the Upper East Side sets off a chain of events that could end up destroying Chuck and those closest to him.

The Kills - Heart Is A Beating Drum

Squeak E. Clean - Mon Amour

Tapes 'n Tapes - One in the World

Cold War Kids - Sensitive Kid

Peanut Butter Lovesicle - State of I

Lykke Li - Youth Knows No Pain

Daniel May / MasterSource - Drinks On The House

XOXO

420 The Princess And The Frog

Blair's dreams appear to be coming true, but Serena threatens to jeopardize it all by dredging up Blair's past. Charlie befriends Vanessa, who may or may not have a hidden agenda. Nate is torn between his relationship with Raina and a truth he must keep hidden out of loyalty to Chuck

Stella Project - Aeroplane

Sam Jaffe - Cross

Les Bellas - Drown

Nicki Minaj - Fly

Bright Eyes - Ladder Song

Michael Mazochi - Lonely Key

Oh Land - Wolf & I

Mozart - Serenade In G, K. 525 'Eine Kleine Nachtmusik' - 3. Menuetto (Allegretto)

XOXO

419 Pretty In Pink

Serena enlists Charlie to go undercover Gossip Girl-style to determine why Dan and Blair are spending so much time together, and what role an unexpected visitor is playing in their lives. With Nate's help, Raina decides to go on a search for her long-lost mother. Chuck's hopes about his legacy are dashed with the reveal of devastating information from the past.

Two Hours Traffic - Noisemaker 

The Ting Tings - Hands 

The Vaccines - If You Wanna 

Danica 'The Morning Star' Rozelle - Kiss Kiss Kiss

The Asteroids Galaxy Tour - Safety Dance

The Pierces - We Are Stars 

Oh Land  - White Nights

XOXO

418 The Kids Stay In The Picture

As Lily awaits the consequences of her decision, William van der Woodsen, CeCe and Lily's sister, Carol, come into town to support her and be part of a Taschen photo shoot on "modern royalty" in which the Rhodes family is participating. Unbeknownst to Carol, who has always chosen to keep her daughter Charlie far away from the Upper East Side, Charlie has followed her to New York to meet Serena and the rest of the family. Blair has an epiphany about her future, and grapples with the knowledge of whom she's destined to be with.

Sola Rosa - Del Ray

Sola Rosa - King Of Hush

The Shapes - Escape From New York

The Mercies - Out Of Nowhere

Electric Sunset - Prayer

I Blame Coco - Self machine

Hurricane Bells - The Deep End

The Naked And Famous - The Sun

XOXO

417 Empire Of The Son

Ben's mother comes to town, forcing issues to the surface between Ben and Serena. Russell Thorpe is determined to destroy Chuck's family legacy, but he risks alienating his daughter, Raina, in the process.

The Vaccines - Somebody Else's Child

Matt and Kim - Where You're Coming From

Buva - Can't Stop Thinking

Nouvelle Vague - Blister In The Sun

Les Sans Cullotes - Les Sauvages

Sola Rose Ft. Bajka - Humanised

Nous Non Plus - Catastrophe

B.o.B - Don't Let Me Fall
 The Duke Spirit - Don't Wait

XOXO

416 While Your Weren't Sleeping

It wouldn't be a proper Upper East Side party without some major Gossip Girl drama, and for Eric's 18th birthday celebration there is plenty to go around. Blair decides to speed up the time table on her career path to becoming a powerful woman, but ultimately stretches herself too thin. Serena is forced to choose between her family and Ben. Chuck and Lily's relationship remains icy in the aftermath of Lily's betrayal.

Rye Rye Ft. M.I.A - Sunshine

Matt And Kim - Wires

Quitzow - The Cut

Ke$ha - Tik Tok

Monarchy - The Pheonix Alive (The Octans Edit)

Erik Hassle - The Thanks I Get

XOXO