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At age 46, Jennifer Lopez is hotter than ever!

The actress, pop singer  and mother of 7-year-old twins turned heads at her birthday party at the 1OAK Southampton nightclub in Southampton City, New York on Saturday.

J.Lo sported a sexy black cut-out knee-length Bao Tranchi dress with cap sleeves, a scoop neckline and sheer cut-out panels that showed off plenty of cleavage and her signature curves. She paired the look with black strappy sandals.

Lopez turned 46 on Friday and posted that day a throwback photo of herself as a child at a previous celebration.

Jennifer Lopez

Jerritt Clark/Getty Images

Jennifer Lopez

Jerritt Clark/Getty Images

At her 46th birthday party, she was accompanied by her beau Casper Smart, 28, who sported a cornflower blue blazer over a white, crisp, button-down shirt and black pants.

"J.Lo and Casper never left each other's side," a source told E! News. "They held hands when they walked in. Looked very much together."

Jennifer Lopez, Casper Smart

IGGI / Splash News

The two later posed for photos inside the party.

Jennifer Lopez, Casper Smart

Matteo Prandoni/BFA.com

Lopez appeared to be in great spirits and was seen hanging by the DJ booth.

Jennifer Lopez

Jerritt Clark/Getty Images

She also hung out with rappers French Montana, 30, and Fat Joe, 44, as well as Mexican singer Thalía, 43.

The Bronx is out tonight ?? @jlo @fatjoe #Thalia ??

A photo posted by French Montana (@frenchmontana) on

"What a special girl," Fat Joe said on Instagram. "Never changed on me ever. I'm blessed to have her in my life."

—Additional reporting by Sara Kitnick