Tim Nwachukwu/Getty Images Usher doesn't think his intimate moment with Alicia ... he and Keys' music producer husband, 45, laughed about what people were saying about the pair's close hug on ...

While the Kansas City Chiefs and San Francisco 49ers players regrouped at halftime, Usher took the field to perform with surprise guests Alicia Keys, Ludacris and Lil Jon, among others.