When it comes to rocking the red carpet, J. Lo isn’t afraid to show a bit of skin.Startraks Photo (left); ImageDirect (center); Splash News (right)

J.Lo may be 45 and a mom to twins, but she wowed the red carpet Tuesday night at the Fashion Rocks concert in a barely there black gown reminiscent of the famous crotch-skimming Versace number she wore to the 2000 Grammys.

But there have been plenty of other times where Jenny From the Block dared to bare almost everything.

With that in mind, here are some of the pop star’s most head-turning fashion moments that were heavy on the sex appeal — and not so much on the fabric.

Two-piece wonder

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The singer was bronzed and beach-ready in a sequined bikini top and see-through micro-mini during her performance at the 1999 Billboard Music Awards.

The history maker: Versace va- va-voom

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The infamous (and almost invisible) Versace dress the superstar wore to the Grammy Awards in 2000 had everyone talking — and left little to the imagination.

Ab fab

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The “Fly Girl” showed off her assets — wearing an all-white getup that included a belly-baring crop top and skintight pants — at the MTV Video Music Awards in 2000. She went on to win the award for best dance video for her hit “Waiting for Tonight.”

Braless on the ‘Block’

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In the 2002 music video for her single “Jenny From the Block,” the Bronx babe opted for a braless look, pairing a white fuzzy knit with sleek metallic briefs and vampy red lips.

Bennifer throwback

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Back in the days of Bennifer, the actress donned this low-cut noir halter dress to the 2003 premiere of “Gigli,” the blockbuster flop co-starring then-beau Ben Affleck.

Body-conscious

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The singer-actress rocked the 2011 American Music Awards with a killer performance with rapper Pitbull. But the high note of the night was this crystal-embellished nude bodysuit.

A cut above

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Showing off her cut physique, the 45-year-old “American Idol” judge sizzled on the red carpet in a sexy silver cutout gown by Charbel Zoe at the MTV Video Music Awards in August.

Booty call

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For Tuesday’s Fashion Rocks concert, the sexy songstress opted for a slinky black dress with cutouts, complete with gold-plated details and a thigh slit. Later in the night, she busted a move in a bootylicious sequined minidress while performing onstage.