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Rick Fox, Eliza Dusku

Fame Pictures

Eliza Dushku and Rick Fox turned up the heat in Miami today.

The couple competed in the third annual Nautica South Beach Triathlon Sunday to benefit St. Jude Children's Hospital. They held hands during a portion of the race, which included a half-mile swim, 19-mile bike ride and a four-mile run, and crossed the finish line at the exact same time.

The Dollhouse star tweeted, "I feel like I ate the SUN! My body's burning up right now. We finished 2hrs45mins. @rickafox came in 1st place in male celeb division!"

Fox also took to Twitter to celebrate their accomplishment: "SURVIVED! Most amazing experience with Eliza racing my first triathlon in Miami..I finished 1st and last all in one in the male Celeb Div." (He was the only person in the division.)

Other celeb participants include soap star Heather Tom from The Bold and the Beautiful, who placed first in the female celebrity division with a time of 2:05, and The Biggest Loser's first female champ, Ali Vincent, who clocked in at 2:17.

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Eliza and Rick aren't the only celebity-athlete romance. Check out our Stars and Their Sport Studs photo gallery!