Hayden Panettiere Cheers on Boxing Boyfriend!

Hayden Panettiere sits ringside with her brother and father as her boyfriend, Wladimir Klitschko, gains a knock out victory against Samuel Peter in Frankfurt, Germany on Saturday (September 11)

Also ringside was Wladimir‘s sister-in-law, Natalia Klitschko who was quite friendly with Hayden all night!

The former Heroes hottie just turned legal last month and celebrated her 21st birthday!

15+ pictures inside of Hayden Panettiere cheering on her boxing boyfriend, Wladimir Klitschko…