Hailey Bieber showed off her playful side as she helped Kylie Jenner celebrate her 29th birthday with a wild party in Beverly Hills over the weekend.

The 29-year-old Rhode founder gave her nearly 60 million Instagram followers a glimpse inside the intimate celebrations, which saw guests embrace a “princess kitty” theme with tiaras and feather boas.

In one particularly cheeky photograph, Hailey was pictured wearing a sparkling tiara and fluffy pink feather boa as she posed on her knees behind a friend, playfully sticking out her tongue towards her pal’s lower back.

The photograph was originally shared by Devon Lee Carlson, another member of Kylie and Hailey’s close circle, before Hailey reposted it to her own Instagram Stories.

Another image showed the mom-of-one getting behind the bar, enthusiastically shaking a cocktail mixer while still wearing her crown and boa.

Inside Kylie Jenner’s birthday celebrations

Although Kylie doesn’t officially turn 29 until Monday, the beauty mogul got the celebrations started early with an at-home party on Friday night.

Hailey wasn’t the only famous face in attendance. Kylie’s older sisters Kim and Khloé Kardashian also joined the festivities, while Hailey’s husband, Justin Bieber, was reportedly among the guests.

The playful evening offered a rare glimpse of Hailey letting her hair down amid what has already been a busy summer.

The model followed up her party pictures with an Instagram photo dump titled “August so far”, sharing everything from her beauty routine and workouts to sun-soaked summer moments.

In the opening photograph, Hailey posed for a mirror selfie while getting ready, wearing bright yellow eye patches from Rhode’s collaboration with Justin’s Skylrk brand as her brunette locks sat in rollers.

She also shared a striking mirror selfie wearing a tiny neon yellow bikini, which showcased her toned physique and golden tan.

Another relaxed shot showed the model lying in the grass with her arms stretched above her head as she soaked up the summer sunshine, while a workout clip captured her performing weighted squats with a trainer.

Hailey even gave followers a rare peek at what she eats, sharing a meal featuring meatballs, cheese, cottage cheese and pasta.

Hailey and Justin prepare for family milestone

The celebrations come shortly before Hailey and Justin mark a particularly special milestone of their own.

Their son, Jack Blues Bieber, will celebrate his second birthday on August 22. The couple welcomed their first child in August 2024, six years after tying the knot.

Hailey has previously revealed that she hopes Jack won’t remain an only child.

“I know I want more than one,” she said during an appearance on the In Your Dreams podcast in October 2025. “I always knew I wanted to be a mom, though,” she continued. “Since I was a little kid, I always envisioned myself having kids.”

However, becoming a mother also changed the way she viewed other people’s decisions around parenthood. “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,” she said.