Hayden Panettiere and Wladimir Klitschko
While rising to fame as the NBC drama "Heroes," Hayden Panettiere started dating Ukrainian boxer and Heavyweight Champion Wladimir Klitschko in 2009. The couple overcame big differences in height (she's 5 foot 2 inches tall while he stands at 6 foot 6 inches) and age (she's 13 years younger) for two years before breaking up in May 2011. However, they later reunited and announced their engagement in October 2013. On Dec. 9, 2014, Panettiere gave birth to their daughter, Kaya Evdokia Klitschko.