Thursday, May 26, 2011 4:22am ET by  
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Katy Perry and Usher up for APRA awards

American music stars Katy Perry and Usher have both been nominated for Australasian Performing Right Association (APRA) awards. 

The list of nominees was released last night, May 25, and Perry's 'California Gurls' will battle it out against Usher's 'OMG' in the International Work of the Year category.

Other acts up for the title include Owl City with 'Fireflies', Train with 'Hey, Soul Sister' and American Idol star Adam Lambert with 'Whataya Want From Me'. 

The ceremony will take place on June 21 in Sydney, Australia and you can watch Katy Perry's performance of 'Firework' from a recent Victoria's Secret fashion show here: