Just nine months after their R&B-lite debut made the bubblegum set scream, the teenage quartet already have a second disc. This time, between sweet-harmonied ballads, they cue up randy singles (”Bump, Bump, Bump” with P. Diddy), bouncy odes to cruising chicks (”Back It Up”), and ”gangsta” boasting. Shouldn’t someone be setting a curfew?
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