EXCLUSIVE: Jennifer Lopez shares the beauty rule she follows every day (no matter what!)

Jennifer Lopez Reveals Her Best, and Free, Beauty Secret

Jennifer Lopez got candid with ET about maintaining her priorities -- and looks -- while starring in her first TV series, Shades of Blue.

For the 46-year-old singer and actress, beauty rest is a necessity.

"There is a limit," J.Lo stressed to ET. "You will fall down at a certain point, and mommies can't do that. Mommies have to be good for the babies at all times. They need to know that you're solid and strong and good. Sleep is very important. I get my seven to eight hours sleep no matter what."

WATCH: Jennifer Lopez Is a Beautiful (and Badass!) Cop in First 'Shades of Blue' Trailer

Finding time for adequate rest has become trickier for Lopez while she films "Shades of Blue."

PHOTOS: Jennifer Lopez hosting the 2015 AMAs

2015 AMAs: Jennifer Lopez outfits - American Music Awards
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EXCLUSIVE: Jennifer Lopez shares the beauty rule she follows every day (no matter what!)

J.Lo kicked off the night in a tribal-printed bodysuit that flaunted her fab bod while she nailed a killer dance routine to all of the year's top hits, including "Uptown Funk," "Anaconda" and "Girl Crush."

(Photo by Kevin Winter/Getty Images)

She's pretty in pink! The hostess with the mostest did a 180 and stepped out in a gorgeous red and pink gown with a massive, flouncy skirt.

Get the look here.

(Photo by Kevin Winter/Getty Images)

J.Lo was caught in her towel and monogrammed robe backstage and of course the diva still looked flawless!  

(Photo by Charley Gallay/AMA2015/Getty Images for dcp)

Just a few minutes later, the star dazzled in a nude, caged midi dress and spiked Louboutins.  

(Photo by Lester Cohen/WireImage)

J.Lo looked appropriately like an awards show statuette in a glimmering gold sequined gown.

Get the look here.

(Photo by Lester Cohen/WireImage)

The star then dazzled in a gauzy, sheer cape-like gown with romantic floral beading and a white accent belt. 

Get the look here.

(Photo by Lester Cohen/WireImage)

Now that's a jumpsuit! J.Lo was glowing in a mustard jumpsuit with a plunging neckline and cape.

Get the look here.

(Photo by Kevin Winter/Getty Images)

Wowzas! The star flaunted her incredible bod in a totally sheer gown that left very little to the imagination.

(Photo by Kevin Winter/Getty Images)

We don't know about you, but this navy, semi-sheer jumpsuit with a plunging neckline had us seeing stars.

(Photo by Charley Gallay/AMA2015/Getty Images for dcp)

LOS ANGELES, CA - NOVEMBER 22: Host Jennifer Lopez attends the 2015 American Music Awards at Microsoft Theater on November 22, 2015 in Los Angeles, California. (Photo by Charley Gallay/AMA2015/Getty Images for dcp)

The host turned heads in all of her sexy looks, but she closed out the night in a very revealing frock that might just rival her infamous green Versace dress. 

(Photo by Lester Cohen/WireImage)


J.Lo stars in the NBC drama, which she produces, as single mother Detective Harlee Santos, who gets involved with a "tight-knit group of dirty cops." The stakes are raised when she is forced to work with the FBI's anti-corruption task force and rat out the corrupt cops on her own team.

When her days on set are over, Lopez switches gears from "serious actor mode" to mommy mode, as she heads home to spend quality time with her 7-year-old twins Emme and Maximilian.

MORE: Casper Smart Is Playing a Bad Guy on J. Lo's Series 'Shades of Blue'

"I have to see them because if I don't see them and they don't see me, then it's not happiness," Lopez said. "Like, this morning I had to work out, then I sit down and I have lunch with them before I come over here and then I go, 'You know what? Since we're shooting all the way through, I'll have the kids come over at 6:30. They can bring me dinner because we had some leftovers.' Every day is like that!"

Between her long work hours and the time she carves out for her kids, Lopez admitted she's had less time to be in the gym, but she'll be in tiptop shape for her Las Vegas residency at Planet Hollywood's AXIS Theater, which kicks off Jan. 20.

MORE: Jennifer Lopez Lands Las Vegas Residency!

"I feel a tiny bit out of shape right now, but that's OK, because I 'm about to get in shape," Lopez said. "We'll tighten it back up real quick."

Shades of Blue premieres Jan. 7 on NBC.

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