Birthday girl Hailey Bieber shared glimpses of her workout routine, showcased her post-baby body, and celebrated her 28th birthday with a glamorous bash with her famous pals.

Hailey Bieber, 28, flaunted her toned midriff in a series of clips uploaded to her Instagram stories on Friday. The Rhode founder, who gave birth to her first child with Justin Bieber in August, showed off her enviable post-baby body while giving a sneak peek at her fitness routine.

In the gym, Bieber performed exercises with a blue resistance band and ankle weights. She opted for a black cropped top, fitted shorts, sneakers, and a low ponytail. She penned, “bday burn @kirstygodso,” referring to her trainer.

Hailey has provided regular updates on her post-partum journey, sharing mirror selfies and attending Pilates classes. She first revealed her stomach in October, two months after delivering her son Jack.

Bieber and Justin welcomed their son, Jack Blues Bieber, in August. The singer announced the news on Instagram with a photo of the newborn’s foot. In October, Hailey gave her first interview since becoming a mother, discussing the challenges of running Rhode and the importance of pivoting amidst obstacles.

Hailey’s abs-baring post coincided with her 28th birthday, which she celebrated with a martini-themed bash, sharing moments with close friends like Kendall Jenner, Justine Skye, and Lori Harvey. She posed for photos in a stylish black outfit complete with a plunging jacket and feathery details while holding her drink.

Guests enjoyed a table filled with drinks and desserts, including a special cake inscribed with “a tini bit 28” and topped with gold and blue icing. Bieber captioned it with an added martini emoji to the photo of the cake.

Hailey’s dedication to her fitness and her zest for life are evident in her recent Instagram updates, showcasing her journey as a mother, entrepreneur, and birthday girl.