From WENN.com

The Heroes star was first linked to the American football star shortly after she ended her relationship with Russian boxer Wladimir Klitschko last year (May11), but she has apparently called time on her latest romance.

Sources tell TMZ.com the break-up was completely amicable, with one insider insisting, ""They will probably be back together sometime down the road.""

Talking about her beau just one month ago (Nov12), Panettiere seemed smitten, telling Access Hollywood, ""Mine's pretty... He's prettier than me.""