Greg James - Thursday - Katy Perry is Greg's mystery guest!

Greg was expecting The Chuckle Brothers as his mystery guest today, however, he turned a shade of crimson when kooky songstress, Katy Perry, walked into the studio! We played another game of 'What Happened Next?', but alas, nobody guessed tight this week. Plus, Greg spoke to Simon Mundie who was live at Wimbledon!