Katy Perry has confessed to having a crush on Jessie J ahead of her performance at today’s Capital Summertime Ball.

The 27-year-old, who will perform in front of 80,000 fans at the Wembley Stadium event, told Capital FM that she is excited to be on the same bill as so many great artists, particularly a certain The Voice coach: 

“It's great company- lots of fun people that are going to be on stage. I love Jessie J, I have such a bad crush on her. She's just cool – she's cool."

"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. 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 ‘Price Tag’ star had earlier admitted she’d be up for duetting with Perry and fellow US performer Kelly Clarkson at the gig when asked by the station:

“Why not, I'm happy to do it. If Katy and Kelly are listening – let's get it on, let's sing a song."

"It's been thrown down from Jessie J to Katy Perry and Kelly Clarkson. What could we do? Something big – maybe a medley. Wow, could you imagine?"