Selena Gomez: "Come & Get It"

Call it Gomez's Justin Bieber breakup song if you want. The more accurate description, though, is "Rihanna-wannabe anthem." Stargate and Ester Dean, the team behind some of Rih's biggest smashes, have given Gomez the good stuff: an unimpeachably catchy big-pop stomp, with come-hither lyrics and a string of moody vocal hooks that eerily echo you-know-who.