Natalia Klitschko, Hayden Panettiere

ddp images/Sipa USA

What a sweet girlfriend.

Actress Hayden Panettiere was spotted rooting for her boxer boyfriend, Wladimir Klitschko, along with his sister-in-law Natalia during his heavyweight world championship title match against Francesco Pianeta in Mannheim, Germany.

And it seemed as though her support wasn't for nothin'—her man ended up walking away a winner.

"60th win for Wladimir and 52nd knockout! Congrats Champ! #klitschkovspianeta," Klitschko's joint Twitter account with his brother, Vitali, posted.

The 23-year-old celeb and her 32-year-old beau, who have been the subject of engagement rumors recently, got back together in January after previously ending their two-year relationship in May 2011.

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