Bruno Mars has a lot to do with a lot of songs we hear on the radio these days, except for Katy Perry's "California Gurls".  That is until he did a cover of it at an appearance on BBC's Radio 1 in London!

This is a great performance, he slowed the song way down, changed some words and did it all on the piano.  Hear his version now and look for Bruno Mars to be performing on the Grammy Awards on February 13th on CBS.