Katy Perry's "California Gurls" are still dancing up a storm at the top of the pop charts
The summer anthem, featuring Snoop Dogg, has scored a fourth week at number one on the Billboard Hot 100 countdown, just fending off a challenge from Eminem, who shoots to number two with his Rihanna collaboration "Love the Way You Lie."
Usher's "OMG," "Airplanes" by B.o.B. and Travie McCoy's "Billionaire" all drop spots to round out the new top five.


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