The privileged prep school teens learn that Serena van der Woodsen is back.

In the wake of a party, Serena receives an ice-cold reception from her best friend.

Blair uncovers information about Serena that may not remain a secret much longer.

Blair is thrilled when her mother chooses her to be the new face of her clothing line.

Dan makes elaborate plans to impress Serena on their first official date.

Dan is torn between two girls when his childhood friend Vanessa returns home.

Serena and Dan finally acknowledge that they are crazy about each other.

Blair puts on a happy face for her 17th birthday party.

Dan naively invites Serena and her family to celebrate Thanksgiving with his family.

Serena has no intention of attending the Ball, until it's announced that Serena must attend.

Blair's father comes home for the holidays with his boyfriend.

The gang breaks into the school swimming pool for an impromptu night of fun.

Gossip Girl reports that Serena van der Woodsen has been spotted buying a pregnancy test.

Blair returns to school after losing her Queen Bee status.

Serena's world is turned upside down when her former friend returns to Manhattan.

One of the Upper East Side teens reveals that he's gay.

Serena falls back into old habits; Dan assumes the worst.

Blair and Georgina face off.

Gossip Girl heads to the Hamptons' talked-about White Party.

Nate learns the downside of an affair with an older woman.

Jenny may lose her internship with Eleanor.

Vanessa learns a scandalous secret and enlists Blair's help.

Blair decides to sabotage her mother's show at Fashion Week.

Blair, Serena, Dan, Nate and Chuck visit Yale University.

To get revenge, Blair convinces Chuck to seduce Vanessa.

A young model encourages Jenny's wild side.

Aaron has been keeping a secret from Serena.

Jenny moves in with Agnes.

It's Thanksgiving, and everyone is battling.

Blair and Chuck make a bet at the annual Snowflake Ball.

A sudden and tragic event impacts the lives of everyone.

Chuck's uncle, Jack, arrives.

Bart's will is read and Dan learns his father's secret.

The students find out who is accepted to Yale University.

Blair plans to get revenge on her teacher.

The gang finds their lives echo "The Age of Innocence".

Blair explores her dark side.

Jenny's 16th birthday party turns into a huge social event.

Serena returns from Spain. The Waldorfs host a Seder dinner.

Georgina returns.

Blair pressures Georgina.

Flash back to Lily's life in 1980s L.A.

Gossip Girl sends a shocking email in the season finale.

Serena returns from Europe with many secrets to hide.

Georgina has plans for Blair at NYU.

Serena thinks Carter is up to old habits.

During the first day of school, Jenny takes her place as the new Queen Bee.

Will Lily and Rufus get married?

Vanessa vies with Blair to deliver the freshman toast.

Chuck's club opens

Olivia appears on Jimmy Fallon's talk show.

Jenny wants to be the ultimate Queen Bee.

Hoping to impress the elitist theatre kids at NYU, Blair sets her sights on landing a private concert.

Thanksgiving on the Upper East Side means major drama.

Dan and Vanessa try navigating their complicated friendship.

Chuck tracks the woman he saw at his father's grave.

Chuck learns more of the mysterious woman.

Jenny ponders her relationship with Damian.

Chuck finds himself once again at odds with his uncle Jack.

Chuck and Blair's relationship is put to the test.

A very pregnant Dorota gets married!

Dr. William van der Woodsen unexpectedly shows up in Manhattan.

William continues to stir up problems.

Things get tense between Rufus and William.

A Gossip Girl gossip bomb involving Dan explodes Serena and Nate's relationship. Who doesn't love a great season finale? XOXO, Gossip Girl.

The highly anticipated Season 4 opener begins in Paris.

A whole new Chuck Bass adjusts to a fresh start in Paris.

Blair tries to gain membership in an exclusive social club.

Nate decides to confront Juliet.

A Gossip Girl blast starts a damaging rumour about Serena.

Jenny returns to Manhattan for the chance to meet Tim Gunn.

Blair is surprised at her birthday party.

Can Chuck and Blair put the past behind them to be friends?

Chuck throws a "Saints and Sinners" masquerade party.

Someone is hospitalised. Nate tries to help his parents.

Blair and Dan try to find a missing Juliet.

A former associate of Chuck's dad has unfinished business.

It's Blair vs. Dan when both get internships at magazine.

Damien stirs up more drama.

Chuck fights to save Bass Industries.

Serena must choose between her family and Ben.

Russell Thorpe is determined to destroy Chuck’s family legacy, but he risks alienating Raina.

Blair has an epiphany about her future.

Serena is suspicious of Dan and Blair.

It's war between Serena and Blair.

Jack Bass returns to New York, jeopardising Chuck and those closest to him.

In the explosive season finale, Blair must make a choice between the men in her life when her life is in danger.

Spotted: Our favourite Upper East Siders in Los Angeles!

Diana has an exciting prospect for Nate.

Nate must decide whether to cross moral lines.

Dan decides to reveal his book to his friends and family.

Serena must choose her job or her relationship with Dan.

Blair auditions her potential bridesmaids.

It's masks and more at theatre experience "Sleep No More".

Serena plans a dream bridal shower for Blair.

Nate takes on a new role at the Spectator.

Lily officially introduces Charlie to New York society.

Blair reveals to Serena what happened after the car crash.

Blair's bachelorette party!

Will the royal wedding be a disaster?

Blair must make a difficult decision about her future.

Nate throws a Valentine's Day party.

Dan's book is showcased by Upright Citizen's Brigade.

Blair thinks Cyrus may have found a potential loophole in her prenup.

Ivy finds an unlikely ally in William.

Serena tries to make Lola the next It Girl.

Blair and Dan host a glamorous British-themed Salon.

Nate digs into Diana's past.

Chuck, Nate, Blair, Serena and Lola team up.

Serena poses as Blair at an important meeting.

In the season finale, Blair chooses between Chuck and Dan.

In the season premiere, Serena has gone missing.

Serena hosts a gala to prove herself in adult society.

Blair relies on help from an unlikely source.

Georgina urges Dan to choose a date.

Eleanor gives Blair an ultimatum.

Unexpected emotions arise as Serena volunteers to help Dan.

A close ally reveals Chuck's plan to bring down his father.

Serena and Dan throw their first Thanksgiving together.

Blair is concerned for Chuck's safety and devises a plan.

In a fashionable farewell to remember, our favourite Upper East Siders join forces for one last soiree in the Series finale, and the shocking identity of Gossip Girl is finally revealed!