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Gossip Girl couldn't guarantee a look inside "the scandalous lives of Manhattan's elite" if it didn't invite Hollywood's A-list to take part.
After all, Blair Waldorf (Leighton Meester) is basically an heiress, while Serena Van Der Woodsen (Blake Lively) comes from a family of wealth and notoriety. So, it only makes sense that the two best friends, as well as their equally as well off classmates, would rub elbows with the rich and famous.
And throughout the Gossip Girl's six glorious seasons, there was an impressive amount of schmoozing with actresses, designers, musicians and even some political figures. Rachel Zoe, Lady Gaga and Rachel Bilson are just a few of the stars who made appearances, but upwards of 50 secured their spot in the Gossip Girl universe.
Now, fans are hoping the upcoming HBO Max reboot will feature just as many famous faces and perhaps even some familiar ones—we're looking at you Blake and Leighton.
While we wait for the highly-anticipated Gossip Girl premiere on July 8, take a look back at the best celebrity cameos from the OG series below!
Courtesy of The CWLady Gaga
It wouldn't be a true party if the Upper East Siders didn't have at least one A-list musician performing for all to see. In the season three episode "Last Days of the Disco Stick," the pop star appeared on stage to perform "Bad Romance."
Courtesy of The CWKarlie Kloss
In the season four premiere, the model attended one of Lily Van Der Woodsen's posh parties.
Courtesy of The CWRachel Bilson & Kristen Bell
In the series finale, Rachel and Kristen prepared to audition for the role of Serena and Blair in Dan's upcoming movie when Dan revealed he's the one behind Gossip Girl's account.