With their squeezed-tight knees and vigorously swinging backsides, the ushers do Usher one better.Wearing pink dresses and dark glasses, the bridesmaids swivel and high-step down the aisle with deadpan gyrations, like voguers from the House of Honeymoon. The groom turns a somersault and coolly spins off to the altar, adjusting his tie.And when the bride makes her entrance, white satin churning as she shifts into hip-slinging overdrive, pumping her bouquet in the air to the beat of Chris Brown's "Forever," she gets the s ...