While Usher and Alicia Keys were all smiles during their intimate ... to play her 2003 hit "If I Ain't Got You" and to sing "My Boo," their besotted 2004 duet. The 16-time Grammy Award winner ...

"It's crazy how people think," Usher said in an interview with 'The Breakfast Club' on Monday Usher doesn't think his intimate moment with Alicia ... "My Boo." Usher ultimately said he and Keys ...