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 close inside the club and left hand in hand around 3 a.m. Casper and Jen are planning to spend the Summer together while she's on an international tour with Enrique Iglesias.