The Saturdays performed at the massive Help the Heroes concert in London on Sunday, which raised money for people who have been injured serving in the armed forces.
Loads of stars - including Strictly Come Dancing judge Alesha Dixon - entertained the crowds...
Alexandra Burke was there too - fresh from finding out her latest single Start Without You made it to the top of the singles chart!
Pixie Lott went from being a guest judge on Saturday's X Factor - to getting on stage and putting on an impressive performance for the audience.
Enrique Iglesias strutted his stuff on stage. The money raised will go to the charity, which also aims to help families of wounded troops too.
About 60,000 music fans turned up at Twickenham Stadium in London.
Among the guests was Army Officer Prince Harry - who turned up with some of his friends to enjoy the music.
But the night belonged to Gary Barlow and Robbie Williams - who performed their newest single Shame. It was the first time in 15 years the pair have sung on stage together!