Hayden Panettiere Roots for Wladimir Klitschko at Boxing Championship

Natalia Klitschko and Hayden Panettiere

DDP Images/Sipa

Hayden Panettiere

When your special somebody is a champion boxer, a good fight is just a normal date night.

Hayden Panettiere stayed on the sidelines Saturday to cheer on on-again flame Wladimir Klitschko as he defended his WBA, IBF and WBO heavyweight titles Saturday in Mannheim, Germany.

Alongside Natalia Klitschko (who's married to Wladimir Klitschko's brother and fellow pro boxer Vitali Klitschko), the smiley Nashville star, 23, looked on as her butt-kicking beau claimed victory over Francesco Pianeta.

It's certainly a departure from their recent taco lunch date.