Serena Williams looks unrecognizable form her tennis playing days. Now, the 43-year-old who won 23 Grand Slams, dropped some stunning swimsuit photos after revealing the secret to her weight loss in a candid interview.

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 used GLP-1 medication to lose 31 pounds after facing postpartum weight challenges, saying she now feels healthier and more energetic