EXCLUSIVE: Jennifer Lopez Opens Up About Her Beauty Secrets and How Her Kids Help Her Stay Young

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Jennifer Lopez has been a sex symbol for decades and ET is unlocking her beauty secrets.

For starters, the 47-year-old singer credits clean living (e.g. no smoking, caffeine or alcohol) and staying out of the sun for helping her youthful glow.

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"It's so funny because I always feel like I just started out," Lopez told ET. "And when I think about all the years that have passed it's kind of like, 'Wow, that's how old I am? When did all of this happen?'"

Lopez also credits her 8-year-old twins, Max and Emme, as being partly responsible for her persistent youthfulness.

"They keep you very young and running around, and I still get to dance and perform," she said. "That keeps you very in shape and youthful as well."

Aside from child rearing and performing, J.Lo also sticks to a healthy diet, daily meditation and plenty of sleep.

"Sleep is super important to me," she said. "I learned that when I hit the wall early in my career and got sick. I realized I have a limit. You will fall down at a certain point and mommies can't do that."

And nothing comes before J.Lo's mommy duties. The Shades of Blue star enjoyed some family time over the Christmas holiday, which included documenting the fabulous musical entrance of her mom, Guadalupe Rodriguez.

Judging from the pep in Rodriguez's step, good genes might also be a major contributor to J.Lo's timeless beauty.