Mischa Barton: Bikini Body Secrets Revealed!

Mischa Barton shows off her polka dot bikini as she heads back to her hotel after a day of beach fun on Monday (January 2) in Miami, Fla.

The 25-year-old actress, who was joined by a guy friend, got in some quality sunbathing and even rode on a jetski!

PHOTOS: Check out the latest pics of celebrities in bikinis

A pal of Mischa‘s recently dished how the star stays slim for her bikini!

Mischa keeps toned by “eating really healthy, keeping a mostly vegan diet and running,” the pal told Fox News.