Perry has three huge hits already to her credit, with the two major singles off previous album One Of The Boys - I Kissed A Girl and Hot N Cold - selling 604,245 copies, and 569,513 copies, respectively. Teenage Dream's introductory single, California Gurls (feat. Snoop Dogg) looks likely to beat them both, however, with sales to date of 542,871 including 16,133 in the latest frame, while the title track is itself off to a fast start, with first-week sales ...