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

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

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

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