Serena Williams showed off her slim figure in a bold swimsuit after revealing she’s been using a weight-loss medication. The athlete, 43, sported a bright yellow one-piece as she posed for a series of snaps Thursday. “melanin mellow-yellow ,” she captioned the Instagram carousel — and fans were quick to hype her up in the comments.

Serena Williams has been open about her personal fitness and weight loss journey, especially since becoming a mother of two. Here's everything Serena Williams has said about her weight loss journey.

Tennis great Serena Williams has taken to social media to show off her dramatic recent weight loss wearing an ab-baring, two-piece gown, sports bras and tight baby T-shirts. But she is absolutely sizzling in a new share, showing her in the ocean in a tropical, bright yellow bathing suit with little cut-out.