Whoa, Nelly! Nelly has apologized for a sexually explicit video that appeared on the rapper’s Instagram page earlier this week, featuring a woman performing oral sex on him. The video was quickly deleted from the Grammy Award-winning rapper’s page, but not before some of his followers captured screen recordings and reposted them. “I sincerely apologize to the young lady and her family,” the 47-year-old Texas native, whose name is Cornell Iral Haynes Jr., told US Weekly. “This is unwanted publicity for her/them. This was an old video that was private and never meant to go public,” he added. The…