Usher has scored a fourth non-consecutive week at the top of the U.S. pop charts.
The R&B superstar's OMG has kept Katy Perry, B.o.B and Ke$ha off the top of the Hot 100.
Perry's California Gurls moves up a spot to two, while B.o.B's Hayley Williams collaboration Airplanes slips to three and Ke$ha returns to the top five at four with Your Love Is My Drug.
American Idol winner Lee DeWyze lands the new chart's highest debut - his rendition of U2's Beautiful Day enters the countdown at 24.
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