Hailey Bieber steals the spotlight with bizarre move at Kylie Jenner's party

Hailey Bieber could not help showing her playful side at BFF Kylie Jenner's 29th birthday bash.

The Kardashian star kicked off her early birthday celebrations with a pink-themed party in Beverly Hills over the weekend and including the Rhode founder, other notable personalities also attended the event, including Kylie's elder sisters Kim and Khloe Kardashian.

Hailey took to her Instagram account to share fun insights into the bash, showing her 60 million followers a "princess kitty" theme party with guests wearing tiaras and feather boas.

However, one picture of Hailey grabbed fans’ attention in which she can be seen wearing a silver-pink tiara and fluffy pink feather boa while bowing behind a pal's back and licking her lower back.

The picture was first posted by Kylie and Hailey's other close pal Devon Lee Carlson, which the model later reposted on her Instagram.

For the party, Hailey donned a pink tank top and paired it with khaki pants.

Kylie Jenner's 29th birthday bash:

Kylie kickstarted her birthday celebrations as early as Friday, while she turns 29 on Monday.

Along with Hailey, her husband Justin Bieber was also in attendance, along with Kylie's close friend circle.

Kendall Jenner was also spotted in a group photo wearing a light pink tank top paired with black wide legs along with a tiara and boa.