Jennifer Lopez, who turned 46 on July 24, donned a sexy cutout black Bao Tranchi dress while celebrating her birthday Saturday night at 1OAK in Southampton, New York. Attendees included her longtime manager Benny Medina and boyfriend Casper Smart, reports Us Weekly.

Medina presented Lopez with a toast and a cake. The Bronx-born singer and actress reportedly hung out with Fat Joe, Lola Milan and Mexican singer Thalia while at 1OAK. French Montana joined Lopez's VIP table and spent most of the evening with her.

The Grammy winner's most popular dance hits played throughout the night. She spent time at the DJ booth and tore up the dance floor with Smart, reports Pop Sugar.

Fat Joe posted this picture to Instagram of Lopez with Milan and Thalia at 1OAK:

The rapper also posted a picture of him and J.Lo at 1OAK with a very special message, "What a special girl. Never changed on me ever. I'm blessed to have her in my life. @jlo #happybirthday."

After her birthday bash at 1OAK, J.Lo and Smart were spotted driving in a Mercedes convertible in East Hampton, New York on Sunday.

The "Feel the Light" singer looked beautiful in a multi-colored Milly crop top and matching pleated shorts worn with royal blue stilettos. She spent the day with her 7-year-old twins, Emme and Max, and Smart. Later, she joined friends for a high seas yachting adventure.

The star caption this Instagram picture of her, Fat Joe and Loren Ridinger, "#BdayWeekend recap. My loves @fatjoe and @lorenridinger #LOVE #familia #Squad #friends."

Lopez has been hard at work filming her new NBC police drama, "Shades Of Blue," which is set to premiere in the fall. It is the story of a New York detective and single mother, Harlee Santos, who is recruited to join the FBI's internal anti-corruption task force.