Katy Perry's hit song California Gurls featuring Snoop Dogg, topped the 4 million mark in paid downloads this week.
This is the third fastest song in digital history to have reached that mark. The Black Eyed Peas' Boom Boom Pow took 23 weeks and Ke$ha's Tik Tok took 24 weeks to reach that mark.
Another Katy hit, Hot N Cold, has also surpassed the 4 million mark with 4,597,000 downloads.
Summer song of 2010
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