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Jennifer Lopez Sizzles At 46 In A See-Through, Ample Cleavage Baring Party Dress

Now this is 46—redefined! Jennifer Lopez celebrated her birthday July 24 at 1OAK in the Hamptons, and looked hotter than ever, in a racy black Bao Tranchi dress. Going panty-free underneath the low-cut fitted frock, complete with cutouts and sheer panels down the sides, JLO exposed her famous derriere and ample amounts of cleavage.

(Photo credit: Jerritt Clark/Getty Images)

(Photo credit: Jerritt Clark/Getty Images)

(Photo credit: Splash)

(Photo credit: Splash)

(Photo credit: Splash)

(Photo credit: Splash)

The Shades of Blue actress was accompanied by her 28-year-old ex-boyfriend Casper Smart, and the duo held hands as they walked into the club, and proceeded to party the night away with buds Fat Joe and French Montana. Although the pair broke up back in June 2014, they’ve been spotted back together many times over the last few months, and this birthday was no exception.

PHOTOS: Jennifer Lopez Holding Hands With Casper Smart—Says She’s Only ‘Kind Of’ Single

Earlier in the day, the couple set off the festivities aboard a private yacht, Utopia 3, along with friends and family. The “On The Floor” singer’s children Max and Emme were also along for the celebrations, and JLO kept it fun and flirty in a floral top and matching long flowing skirt, with coordinating shorts underneath, complimenting the look with electric blue strappy heels.

Like a fine wine, the sexy former-fly girl just gets better with age!