There's no doubting that Usher is a global superstar. Just one look at his performance on Ellen late last week confirms it. And combine his star power with that of Mr.Everywhere (Will.i.am) and you've got a track that's destined for the upper reaches of the chart. The clip, although simple, proves Usher's pop credentials; he's an incredible singer, he's an incredible dancer. And he knows what it takes to get the kids in and have them begging for more.