By Natassja Schiel
Updated Jul 26, 2015 @ 3:00 pm
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Is this what 46 looks like? On Saturday night Jennifer Lopez showed up at her birthday bash, held at 1OAK in Southampton, N.Y., looking amazingly hot.

Clad in a black sheer cutout dress that hugged every curve, the multi-hyphenate flaunted her best assets—as in, everything! She accessorized with ankle-strap stilettos and a black clutch and topped off her look with loose shoulder-length waves and a heavily lined glossy lip. Casper Smart accompanied Lopez at the festivities; the Fake Off host, 28, looked sharp in a baby-blue suit jacket with a white button-up shirt:

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JLo’s close friend Fat Joe was also in attendance. He posted pictures of the fiesta to Instagram:

Lopez seems to have been prepping for her big birthday all week. On Thursday, the girl from the Bronx posted a throwback picture of herself to show exactly how far she’s come.