Hailey Bieber let loose at Kylie Jenner’s 29th birthday party.

The Rhode founder attended her close friend’s birthday bash Friday, and reposted a wild shot of herself licking a female friend’s backside on her Instagram Stories.

The original shot was posted by influencer Devon Lee Carlson, and shows Bieber bent down and licking her friend’s left side while wearing a tiara, as the friend — whose face isn’t shown — is bent over a marble counter and holds a drink.

The friend’s hot pink sparkly thong was visible thanks to her low-rise jeans and crop top.

Bieber, 29, reposted another Instagram Story Saturday from Carlson’s sister, Sydney Lee Carlson…

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