Looks like Usher and Ke$ha were a digital force to be reckoned with last week! During the week ending on Mar 6, Usher managed to surpass the 4 million mark with his song OMG, which features will.i.am. This is the first song of Usher's to reach that number. Previously, he surpassed 3 million downloads with 2004's Yeah! Wowsa! Congrats Usher! Keep it up! Ke$ha's We R Who We R also hit a milestone last week, by surpassing 3 million downloads in only its 19th week in release! Very impressive, considering her big breakthrough hit TiK ToK reached the 3 million mark at 18 weeks in release. OMG! You guys rock! more music is what we want cause we r who .... lol!!!!