Singer-actress Jennifer Lopez and her former boyfriend Casper Smart were seen dining and dancing with friends in Las Vegas. Smart and Lopez, along with several friends, dined and danced at the MGM Grand’s Hakkasan Las Vegas Restaurant and Nightclub on Friday, reports people.com. Lopez, who wore a white jumpsuit and carried a leopard Valentino bag, arrived for dinner with friends at the restaurant, and ‘cosied up’ at their Private Dining Room table, said a source.