Hands in the air for American star Usher, as he 'ushers' in Capital Radio's Summertime Ball! He was one of the many big name acts performing at Wembley Stadium on Sunday.
He brought out will.i.am and Justin Bieber for a special performance.
Check out this lucky fan who got up close and personal with the Bieber!
The JLS boys flew in from a recording trip in America for the London event. Their new single, The Club is Alive, is out on 4 July.
Fellow X Factor star Alexandra Burke kicked off her energetic set with Broken Heels.
Alexandra's X Factor mentor Cheryl Cole was also there. It's reported she dropped her mic during Fight For This Love - oops!
Pixie's dress brought 'Lotts' of colour to the concert!
While American star Ke$ha went for the feathered look.
No prizes for guessing which team Dizzee Rascal's backing for the World Cup! His shirt might say number one, but he was knocked off the top of the charts by David Guetta on Sunday.
Another duo that were reunited - here's Chipmunk with Esmee Denters performing Until You Were Gone.
Jason Derulo delighted fans by ripping off his shirt! His song Ridin' Solo is riding high in the charts at number three.
Tinie Tempah was a BIG hit with the huge crowd of 70,000!
Brit Award-winning newcomer Ellie Goulding sang her dreamy hit Starry Eyed.
Music fans were introduced to new boyband The Wanted. They showcased their debut single All Time Low.
Rihanna closed the show with her massive hit Umbrella. Check out the fans who came prepared!