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Hailey Bieber let loose at a Beverly Hills party hosted by her close friend Kylie Jenner in honor of her upcoming birthday.

On Saturday, the 29-year-old Rhode founder shared vibrant photos from the intimate celebration with her nearly 60 million followers. Among the pictures, one provocative shot stood out in particular: Hailey, kneeling in a sparkly tiara and a pink feather boa, posed as if trying to lick the lower back of a friend wearing a thong who was bent over a bar counter. The model reposted this wild photo from the Instagram story of Devon Lee Carlson—another close friend from the Kardashian-Jenner star circle.

"Princess Kitty" Themed Party

All the guests followed the dress code for the lively party, which was held under a "princess kitty" theme. Aside from her striking antics, Hailey herself was spotted mixing cocktails in a shaker—wearing, of course, the very same glittering crown and fluffy boa.

Kylie Jenner decided to celebrate early and gathered friends for a house party on Friday night (the birthday girl's official birthday falls on Monday). According to the Daily Mail, Kylie's older sisters, Kim and Khloé Kardashian, were spotted among the guests, along with Hailey's husband, pop star Justin Bieber.

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