Jennifer Lopez only gets better with age and this year, for her 46th birthday, she wore one of her most revealing dresses yet, making women of all ages envious.

On Saturday night, the singer and actress celebrated the big day at 1OAK in Southampton, N.Y., with a huge bash, according to Us Weekly. Her racy black Bao Tranchi cutout mesh dress stole the show, though, clearly revealing she didn't have much on underneath.

Her longtime producer and mentor Benny Medina made the toast for the birthday girl and brought out a huge cake for her.

She was escorted into the party by her on-again-off-again boyfriend and backup dancer Casper Smart, 28, who told people in the club who were excessively taking photos of her to leave her alone so she could have a great time dancing and enjoying her birthday.

"He had his arm around her, and they were tight all night," a source said. "She was dancing all night, and she looked amazing."

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

Some other guests in attendance were rapper French Montana, long-time friend Fat Joe and Mexican singer Thalia.

Fat Joe, who once collaborated with Lopez, posted a photo of the two to Instagram with a heartfelt message. "What a special girl," he wrote. "Never changed on me ever. I'm blessed to have her in my life. @jlo #happybirthday."

Check out the photos from the fun-filled night and see her sexy dress below!

 What a special girl. Never changed on me ever. I'm blessed to have her in my life. @jlo #happybirthday

A photo posted by FAT JOE (@fatjoe) on Jul 25, 2015 at 9:30pm PDT

Birthday shenanigans ‼️ A photo posted by French Montana (@frenchmontana) on Jul 26, 2015 at 10:11am PDT