Who knew Harry Styles was so popular?!
The One Direction member celebrated an important milestone and almost all of Hollywood was on hand to celebrate.
Multiple celebs took to Instagram over the weekend where they shared pics from the "You and I" singer's 21st birthday bash in West Hollywood, California.
The Brit partied at hot spot Lulu's with celebs like Cara Delevingne, Kendall Jenner and Gigi Hadid.
Delevingne posted several snaps from the event, including one with her fellow model besties sharing a cute moment.
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"Back together," she captioned the photo.
Other stars in attendance included David Beckham, Cindy Crawford and Rita Ora, who posted an adorable shot of the birthday boy's cake featuring a throwback photo of the singer.
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"One of his cakes @harrystyles #lastnight #birthdayboy#happybirthday," Rita captioned the Instagram photo.
What a star-studded event, where's our invite?!
You'll never guess who else was in attendance for the private party! Click "Launch Gallery" to see more pics from inside the bash!