Katy Perry has become only the 14th artist to debut just shy of the top of the U.S. pop charts - CALIFORNIA GURLS enters at two on the new countdown.
Usher's OMG rebounds to number one to prevent a second successive debut at the peak - Eminem's Not Afraid crashed into the top spot last week (13May10).
B.o.B. scores a chart double in the top five, claiming the number three and four spots with Airplanes and former number one Nothin' On You, respectively.
Taio Cruz's Break Your Heart rounds out the new top five, while last week's number one from Eminem slides to six.