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Jennifer Lopez

Sign: Leo

As a Leo who loves to shine in the spotlight, Jennifer Lopez hasn't slowed down at all in the last decade—a key reason why she's been able to hold onto her youthfulness so well. It's thanks to her drive to perform that keeps the singer (who turns 45 this month) looking younger than her years. To maintain her form, J-Lo reportedly puts in daily six-hour dance workouts.

Photo: Kevin Mazur/Billboard Awards 2014/WireImage