With Halloween just two weeks away, we asked Nick Cannon if he and his wife, Mariah Carey, plan to dress up as a couple when we caught up with him last night at Keep a Child Alive’s Sixth Annual Black Ball. “Yeah, we’re going to do something,†he told us. “I want to be Ike and Tina, but she doesn’t want to offend Tina Turner. I think it’s an honor.â€