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9 June 2012, 11:12
The 'Scream' star is excited about performing at Wembley Stadium today for Capital FM.
Usher says he hasn't been able to sleep because he is so excited about performing at Capital's Summertime Ball 2012 later today (9th June).
The 'Climax' singer joins a line-up including the likes of Justin Bieber, The Wanted and Katy Perry who will all perform at Wembley Stadium today, and Usher says he is "pumped" about today's event.
"I haven't been able to sleep all night," Usher tweeted earlier today. "I'm so pumped to hit the stage for Summer Ball 2012 today!!! URIV."
The 'Scream' star is preparing to launch his seventh studio album 'Looking 4 Myself' on Monday (11th June), and will also perform a special intimate showcase gig in London at the HMV Hammersmith Apollo to celebrate the record's release.
The Capital FM Summertime Ball line-up also boasts artists including Jessie J, Flo Rida, Kelly Clarkson, Rita Ora and Ed Sheeran and takes place from 4pm today.
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.