SELENA GOMEZ MAKES SWIFT’S SONG GO VIRAL

Selena Gomez knows how to make a song go viral -- not that Taylor Swift's "I Knew You Were Trouble" needs any help. Last year, Gomez -- along with ex-boyfriend Justin Bieber and a few of their famous friends -- gave "Call Me Maybe" the boost it needed to become a mega-hit with their homemade music video, and now she's done the same for Swift's tune.