U.S. actress Hayden Panettiere, girlfriend of Ukrainian heavyweight boxing world champion Vladimir Klitschko, reacts to Klitschko's victory over his Italian-born challenger Francesco Pianeta at the SAP arena in Mannheim, May 4, 2013. Klitschko stopped former sparring partner Pianeta inside six rounds in Mannheim on Saturday to retain his four world heavyweight title belts. REUTERS/Kai Pfaffenbach (GERMANY - Tags: SPORT BOXING ENTERTAINMENT)