Monday, June 14, 2010 5:04am ET by  

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Usher tops ARIA chart

Usher is number one again for the sixth week in Australia's ARIA singles chart, with his hit 'OMG (feat.'.

The star fended off stiff competition from B.o.B. and Katy Perry. B.o.B. is at number two with 'Airplanes', a collaboration with Paramore singer Hayley Williams, while Perry is number three with her latest single, 'California Gurls'.