Has the future Mrs. Bieber been taking guidance from her prince-of-pop boyfriend? On her first two albums, this Disney star never shook the moonlighting-actor vibe; on When the Sun Goes Down, though, she sounds fully invested in tart electro-disco ditties like ''Bang Bang Bang,'' which strongly recalls La Roux's ''Bulletproof.'' And the top-shelf collaborators don't hurt see: the grinding ''Whiplash,'' co-penned by one Britney Spears. B+
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