Jennifer Lopez Celebrates Her 46th Birthday with Casper Smart – and a Very Sexy Dress

Jennifer Lopez Wears See-Through Dress for 46th Birthday
Jennifer Lopez at 1OAK Southampton
Jerritt Clark/Getty

07/26/2015 AT 11:05 AM EDT

She got that boom!

Age is just a number to Jennifer Lopez – the singer turned 46 on Friday, but still rocked a barely there cut-out and see-through Bao Tranchi dress to celebrate Saturday night.

The "Booty" singer was joined by friends and on-and-off-again love Casper Smart for the festivities at 1 OAK in Southampton, New York.

Lopez, who held tightly to Smart's hand as they entered the club had her nails painted white and wore her new shoulder-length locks in a loose wavy style.

The Fake Off host, 28, opted for a blue suit jacket with a white shirt as he celebrated Lopez.

Jennifer Lopez Celebrates Her 46th Birthday with Casper Smart – and a Very Sexy Dress| Birthdays, Couples, Music News, Casper Smart, Jennifer Lopez

Jennifer Lopez and Beau Casper Smart at 1 OAK Southampton

Jerritt Clark / Getty

The singer hit the nightclub's dance floor and enjoyed a cake from her longtime manager Benny Medina.

Casper Smart spills a secret about J. Lo

Lopez and Smart remained close friends even after their split last year, and have spent an increasing amount of time together over the summer. The pair was spotted strolling hand-in-hand through New York City last month, and attended the Billboard Music Awards in May.

While the choreographer has demurred over the couple's official status, he did tell PEOPLE they're "just having a good time, just being ourselves, that's all."
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