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From Hilary Duff to Tim Gunn, scroll through the gallery for a look at our favorite celebrity cameos from the series' six seasons!
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Hilary Duff
The Lizzie McGuire alum played actress Olivia Burke, who falls for Dan Humphrey while they're both students at NYU.
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Kristen Bell
After voicing the mysterious Gossip Girl since the pilot, the blonde beauty appeared in the series finale as an actress auditioning for the fictional movie based on Dan’s novel.
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Lady Gaga
Blair Waldorf got the eccentric singer to perform at NYU during a Season 3 episode.
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Cyndi Lauper
The legendary singer appeared as a surprise guest at Blair's 20th birthday party.
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Elizabeth Hurley
The Brit played shrewd business woman Diana Payne, who had a fling with Nate Archibald.
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Tim Gunn
The Project Runway mentor, who played himself, dismissed Jenny Humphrey from an interview after realizing that her clothes spelled the word "whore."
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Brittany Snow
The actress played the younger version of Lily Van Der Woodsen in a flashback episode.
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Karlie Kloss
The model appeared as a guest during a party held at the Van Der Woodsen residence.
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Rachel Zoe
The designer played herself in a Season 4 episode, during which a chocolate fountain got dumped on her head.
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Krysten Ritter
The actress starred as the younger version of Carol Rhodes, Lily's sister, during a flashback episode.
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Lisa Loeb
The singer appeared as herself in a Season 1 episode before showing up again in the series finale as Rufus Humphrey's new love interest.
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Michael Bloomberg
The former mayor of NYC popped up in the series finale to express his surprise over Gossip Girl's true identity.
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Tyra Banks
The model portrayed actress Ursula Nyquist in an episode of Season 3.
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Ivanka Trump
The heiress appeared as herself in a Season 4 episode.
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Tinsley Mortimer
The socialite made two appearances as herself on the series.