Singer, actress, designer, author, American Idol judge: In her two-decade career, J. Lo has proven there's nothing she can't do—and that includes giving her music a shot of adrenaline in 2014. A.K.A. is a rousing declaration of vitality, as evidenced by the explosive opening title track, a kiss-off to would-be suitors. With its squiggly beat and guest verse from Bronx bomber French Montana, "I Luh Ya Papi" is one of the most playful Lopez tracks since "Jenny from the Block," while the sensual deep-house pulse of "So Good" packs a sleek, hypnotic energy. While rappers Iggy Azaela and Rick Ross both make appearances, the guest of honor is Pitbull, who joins Lopez for a raucous paean to that most precious of assets, "Booty."