Check out all the best pictures from this year's iTunes Festival 2013, which is set to feature performances from the likes of Lady Gaga, Katy Perry and Justin Timberlake.
Katy Perry On Playing iTunes Festival 2013: "How Could I Leave Out The UK?" - Audio
The 'Teenage Dream' singer also says she hopes her new music "resonates" with her fans.
Katy Perry says she was so excited to play iTunes Festival 2013 in the UK last night (30th September) and would never leave her British fans out.
"How could I ever leave out the UK? I love a Sunday roast, so I'm never going to miss the UK," Katy revealed to Capital's Max backstage at iTunes Festival 2013 on Monday evening. "And not just because of the baked beans, the Sunday roasts and the great fans!"
Katy went on to discuss some of the new songs that feature on 'Prism', saying she hopes they bring inspiration to her fans they they listen to them.
I knew that they would resonate, I knew that they were real, I knew that people would really relate to them," she explained. "That's really my main purpose is to relate to people through songs and for them to get inspired and feel some hope."
Earlier this week Katy also opened up about her boyfriend , 'Your Body Is A Wonderland' singer John Mayer, describing the songwriter as a "genius".
Katy Perry is set to officially release her new album 'Prism' on 21st October.
Listen to Katy Perry chatting to Capital's Max backstage at iTunes Festival below: