Last year, Trainor topped the charts with her body-positive smash “All About That Bass,” a reference to her derriere. “Yeah, it’s pretty clear, I ain’t no size 2,” she half-raps on the doo-wop inspired, Grammy-nominated hit, “I’m bringing booty back.” When asked if she was afraid of being a one-hit wonder, the 21-year-old Nantucket, Mass. native answered confidently, “No—I’m a songwriter. That’s not even my best one.” True enough, she scored again with her followup single “Lips Are Movin.’” Now Trainor has an album’s worth of sassy, self-empowerment songs, from “Dear Future Husband” and “Mr. Almost” to “No Good for You.” There’s plenty of ukulele, handclaps, finger-snaps, retro harmonies and acoustic bass that make a playfully infectious sound. And when Trainor teams up with John Legend on the soulful duet “Like I’m Gonna Lose You,” it’s clear she’s the real deal—and destined to be one of 2015’s major stars.