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AUG 29, 8PM
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Hayden Panettiere

BAUER-GRIFFIN.COM

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As if activewear wasn't unforgiving enough, Hayden Panettiere raises the bar and lowers the coverage for sportswear by playing tennis in a teeny-tiny brown string bikini. Dayum!

The former Heroes star was looking her usual fit self in Maui, Hawaii, with her equally fit NY Jets wide receiver boy-toy, Scotty McKnight.

But this isn't the first time the starlet was linked to an athlete...

Panettiere dated heavyweight boxer Wladimir Klitschko for almost two years. She and McKnight met in February of last year when his BFF and fellow Jet, Mark Sanchez, brought his bud to a pre-Oscar party. "He was standing there and Hayden approached him and said, ‘You look bored,' and they got to talking," one source said.

Well, it definitely looks like they are enjoying staying "fit" together. We bet he makes her bend over to pick up the balls...