Jennifer Lopez Wears Her Most Revealing Dress Yet for 46th Birthday Bash: Pictures, Details!

Jennifer Lopez
Jennifer Lopez showed off her curves in a racy black cutout dress for her birthday party in Southampton, N.Y. on July 25.  Jerritt Clark/Getty Images

Forty-six never looked so flawless! Jennifer Lopez rang in her 46th birthday on Saturday, July 25, at 1OAK in Southampton, N.Y., with a big bash. 

The Grammy winner looked fierce in a racy black Bao Tranchi cutout dress with an open back and sheer paneling on the sides to show off her underwear-free booty. 

Jennifer & Casper Arrival to BDay
Jennifer Lopez and Casper Smart hold hands on the way to her birthday party at 1OAK in Southampton, N.Y. on July 25. Splash News and Pictures

Inside the party, Lopez's longtime producer and mentor Benny Medina made the toast and brought out a big cake for the birthday girl while guests sipped on gluten-free summer cocktails from Ciroc vodka.

"She was dancing all night, and she looked amazing," a source tells Us Weekly. 

Jennifer & Casper Bday
Jennifer Lopez talks to Casper Smart at her birthday party at 1OAK in Southampton, N.Y. on July 25. Jerritt Clark/Getty Images

At one point guests were incessantly taking photos of Lopez, and her on-off love Casper Smart stepped in to save her. The source tells Us that Smart told the guests to leave Jenny From the Block alone so she was free to dance and have a good time. 

"He had his arm around her, and the were tight all night," the source notes. 

Jennifer Dancing Bday
Jennifer Lopez dances next to the DJ at her birthday party at 1OAK in Southampton, N.Y. on July 25. Jerritt Clark/Getty Images

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