Jennifer Lopez gets her drink on at backup dancer's birthday party with Alex Rodriguez.

Who knew Jenny from the block got her drink on once in awhile?
The 48-year-old singer was seen dancing and singing with a glass full of wine in tow Friday night during a Las Vegas birthday party celebration with close pals and her boyfriend Alex Rodriguez, 42.
Alex Rodriguez posted a story on the social media that showed his lady of one year boozing and getting down with friends.

In the Insta-story, Jennifer Lopez leaves little to the imagination thanks to her smoking hot body, sexy moves and barely-there ensemble.
In it, she is sporting a revealing, long sleeve white cut-off top with low-cut white pants.

She didn't switch the outfit up even after wearing it just hours before during a live performance with the Chainsmokers.
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