Hailey Bieber let loose while attending her close friend Kylie Jenner's early 29th birthday in Beverly Hills over the weekend.

On Saturday, the Rhode skincare founder, 29, shared photos from the intimate bash, including a shot of herself appearing to lick a pal's G-string clad lower back.  

Wearing a sparkly tiara and pink feather boa, Bieber was captured sticking her tongue and posing on her knees while her faceless friend bent over a bar counter top.

She reposted the wild shot from Devon Lee Carlson, another member of the Kardashian-Jenner clan's inner circle, to her Instagram Story for her nearly 60 million followers to see.

Another snap, also shared to Instagram, showed Bieber making drinks in a cocktail shaker while still dressed her crown and boa.

Bieber's loud attire was worn by all attendees at Jenner's birthday party, which had a 'princess kitty' theme.  

While Jenner will not officially turn 29 until Monday, she decided to throw her at-home soiree on Friday night.

Also in attendance were Jenner's older half-sisters Kim and Khloe Kardashian as well as Bieber's pop star husband Justin Bieber, as per photos obtained by the Daily Mail.

Along with her behind-the-scenes look at Jenner's birthday get together, Bieber also uploaded a photo dump to her main Instagram feed showing off her 'August so far.'

In the cover photo, the mother-of-one snapped a mirror selfie while in the middle of getting ready for an event. 

She wore bright yellow eye patches from her brand Rhode's collaboration with her husband Justin's Skylrk streetwear brand and her long, brunette hair was up in rollers.

In another photo, Bieber appeared in a skimpy neon yellow bikini that showed off her tanned and toned figure as she snapped a selfie in a mirror. 

Another photo from a separate outing showed Bieber lying down in the grass, raising her arms above her head and smiling as she enjoyed the summer sunshine. 

She also included a short clip of her working out with a trainer and doing squats with a large dumbbell. 

To round out her post, Bieber gave a rare glimpse at her diet by including a photo of her go-to meatballs, cheese, cottage cheese and pasta combo.

While she was busy celebrating Jenner on Friday night, Bieber will ring in her and her husband's son Jack Blues's second birthday on August 22.

Jack Blues is the couple's only child, but Bieber shared last year that they have plans to expand their family.

'I know I want more than one,' she confessed on the In Your Dreams podcast in October 2025. 

'I always knew I wanted to be a mom, though,' she said. 'Since I was a little kid, I always envisioned myself having kids. You know what's funny? 

'The older I've gotten and now that I have a kid, I think any decision anyone makes about having them or not having them is totally amazing.'