Katy Perry has cemented her status as a best-selling superstar with the global success of her second studio album, Teenage Dream, which debuted at #1 in 8 countries. Five single ('California Gurls', 'Teenage Dream', 'Firework', 'E.T.' and 'Last Friday Night') have hit #1 on the Billboard Pop Songs chart, making hers just the third album in the 18-year history of the chart to yield a quartet of No. 1s. She also holds the distinction of being only the ninth album in the 52-year history of the Billboard Hot 100 chart to produce four No. 1s. This follows on the heels of her multi-platinum debut album, One of the Boys, which generated four hit singles: 'I Kissed A Girl', 'Hot N Cold', 'Thinking of You' and 'Waking Up In Vegas'. She wrapped up 2010 in style with 4 Grammy nominations, including one for "Album of the Year." Katy kicked off 2011 with sold-out shows on the European leg of the California Dreams Tour, and will play sold-out shows in Australia, New Zealand and Japan before heading to North America and beyond.