The Jennifer Lopez brand has had a bumpy time lately. Her "Bennifer" romance with Ben Affleck was Cupid's idea of a practical joke, her film career has foundered and her pop profile risks being overshadowed by younger rivals such as Beyoncé.

"It was," as she said in a recent interview, "time to rejuvenate." So now she's back with a new album, Rebirth, which might as well be titled Product Relaunch, for la Lopez is more a one-woman leisure conglomerate than a mere pop star.