Full show replay: http://urlmin.com/grammyz Katy Perry and John Mayer at the 55th GRAMMY Awards 2013 Katy Perry and John Mayer at the 55th GRAMMY Awards 2013 Katy Perry and John Mayer at the 55th GRAMMY Awards 2013 Katy Perry and John Mayer at the 55th GRAMMY Awards 2013 Katy Perry and John Mayer at the 55th GRAMMY Awards 2013 Katy Perry and John Mayer at the 55th GRAMMY Awards 2013
