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9 June 2012, 16:23
The 'Part Of Me' star admits she is excited to share the stage with so many great acts at Wembley Stadium.
Katy Perry has confessed that she can't wait to perform at Capital FM's Summertime Ball 2012 today (9th June).
The 'I Kissed A Girl' star told Capital that she is excited to see Jessie J because she has such a "mad crush" on the British singer.
"It's great company- lots of fun people that are going to be on stage," she admitted. "I love Jessie J, I have such a bad crush on her. She's just cool – she's cool."
The American star, who is making her second appearance at the Ball explained that she enjoys the fact that she can share the stage with so many big acts because it is a guarantee for a "great night".
"I mean it's always nice when there's a bunch of people on the stage and there all stars and there's a bit of a 'who's coming next what are they bringing' type thing," she added. "Maybe it does put a little extra spark in your step, but really it's just fun because you know it's going to be a great night."
The star will perform live at Wembley Stadium in front of 80,000 fans today alongside the likes of The Wanted, Justin Bieber and Usher.
You can listen to Katy Perry talking about Jessie J to Capital FM's Rich Clarke below:
Capital FM is coming live from the Summertime Ball at London's Wembley Stadium on 9th June.
Keep your eye on the ball by heading to our Summertime Ball area for all the latest news, photo galleries and interviews from this year's event.