PHOTOS: My Furry Valentine

From Kaley Cuoco's life-saver to Taylor Swift's constant companion, see who really has a hold on these celebs' hearts

CARRIE UNDERWOOD

So beloved is the country star's dog Ace that he attended her 2010 wedding to hockey player Mike Fisher – in a pink tuxedo, no less. "He's like my kid," she told PEOPLE. And No. 1 fan, fur sure.