Katy Perry Parties With Rihanna

The 26-year-old American singer Katy Perry hit the town with best friend Rihanna last night (14th April 2011), reports the UK's Daily Mail. Katy Perry met up with the R&B star after she had performed her hit single 'California King Bed' on American Idol.After wowing the 'Idol' audience, Rihanna joined Perry for a "pre-clubbing" meal at Mozza Pizzeria in Los Angeles. The pair then headed to the