The former contestants on the show are said to be lined up to take part in the 2014 series of the show.
Kelly Clarkson Teases Summertime Ball 2012 Set - Audio
The 'Mr. Know It All' singer says fans can expect all the hits at Wembley Stadium later today.
Kelly Clarkson has promised to perform all of her biggest hits tomorrow when she performs at the Capital FM Summertime Ball 2012.
The 'Mr. Know It All' singer will take to the stage at Wembley Stadium on Saturday (9th June) for a live performance, and says all of her fan-favourite tracks are on the setlist for the show.
"I think we're doing like five or six [songs]," Kelly revealed to Capital FM, ahead of her performance. "But yeah, we're doing the songs that everyone will know and want to hear."
Some of Kelly Clarkson's most popular songs include hits like 'My Life Would Suck Without You' and 'Since U Been Gone', as well as more recent hits like 'Stronger (What Doesn't Kill You)' and her new single 'Dark Side' .
Earlier today (8th June) Kelly wrapped her soundcheck on stage at Wembley ready to perform live for 80,000 fans tomorrow evening at the Summertime Ball.
This year's event will also see performances from artists including Usher, Justin Bieber, Katy Perry, Flo Rida and Pitbull.
Listen to Kelly Clarkson talking about her appearance at the Capital FM Summertime Ball 2012 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.
Latest Kelly Clarkson
The 'My Life Would Suck Without You' singer wowed with her rendition of the hit single this past weekend.
The American Idol gave one of her 'Stronger' performances to date at the Summertime Ball 2012 at Wembley Stadium. See the highlights of Kelly Clarkson performing live.
Watch the latest promo from the former American Idol champion right now on Capital.