Sin City got a double dose of celebrity last night when Jennifer Lopez and Marc Anthony took the stage together at Mandalay Bay. The pair reunited in Las Vegas for a live showcase of the acts they discovered while taping their reality show, ¡Q'Viva! The Chosen. J Lo and Marc were all smiles and shared a loving embrace, though they performed separately in front of the sold-out crowd.
Later in the evening, J Lo moved the party to the Hyde nightclub inside the Bellagio. She was joined by Casper Smart to celebrated the launch of her latest single, "Goin' In." The couple kept a close distance inside the club and left hand in hand around 3 a.m. Casper and Jen are planning to spend the Summer together while she embarks on an international tour with Enrique Iglesias.