Slide the button to see her slim-down! She is a part of the fitness nation! The 46-year-old singer once tipped the scales at 180 lbs., but thanks to daily workouts and Nutrisystem (she's a spokesperson), Jackson has kissed her weight-obsessed days goodbye. "I don't know how much weight I've lost, only because I stay away from the scale," Jackson told PEOPLE. "You're setting yourself up to fail."