Katy Perry and Olly Murs go head to head in a Pop Slam! Amberley Lobo delves deep into the lives of the two stars and meets the people who know them best. Over three rounds, Amberley looks at how they made it big, how hard they have been working and how glamorous their lifestyles have become. Only one act can walk away with the biggest award in pop music, the Ambo. Show less