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Jennifer Lopez celebrated the launch of her new single "Goin' In" at Hyde Bellagio in Las Vegas on Saturday! J-Lo and boyfriend Casper Smart hit the club after Lopez performed a concert at Mandalay Bay. While at the club, she and Casper spent time in their VIP booth, before joining DJ Mick Boogie in the deejay booth, and hitting the floor to do some dancing! Before she left, "Jenny from the Block" gave a message to everyone at the club, saying, "Have the best time and don't get in too much trouble!"