REVIEWED BY JESSICA HERNDON
Not as bubbly as on her double-platinum debut, 2007's Coco, Colbie Caillat undergoes a bit of an emotional shift on her second disc. She's still pining for lasting love, but she's now pairing her smooth delivery with a new edge. "Go on and leave my love out on the street . . . Better believe I'm fearless," she proclaims on "Fearless," the R&B-tinged, Kara DioGuardi-cowritten highlight. And on "Droplets," a duet with Jason Reeves, she assumes the role of heartbreaker. Maintaining the airy beach tone and sing-along quality that made us fall for her in the first place, Breakthrough, produced mostly by her dad, Ken Caillat (Fleetwood Mac's Rumours), is a satisfying way to spend the last days of summer.