Serena Williams flaunted her body transformation in a swimsuit after she confessed to 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.

“You look amazing🔥,” one fan wrote. “What a Body 🔥❤️,” another added.

Williams revealed she lost more than 30 pounds with the help of a GLP-1 prescription.

“I feel great,” she told People Thursday. “I feel really good and healthy. I feel light physically and light mentally.”

The former professional tennis player shared that she began struggling with her weight after she gave birth to her daughter, Alexis Olympia, in September 2017.

“I never was able

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