Surprise Coachella Performance from Paul McCartney

Sir Paul McCartney surprised the Coachella audience during the Californian festival when he popped up and joined Ductch DJ Afrojack on stage.

According to a source who spoke to British newspaper The Sun: "It was a weird and once-in-a-lifetime experience. Paul popped up in Afrojack's set and was having it on stage behind the DJ booth. Nancy was standing behind him like a typical house DJ's girl.

"I think a lot of the ravers thought they were seeing things - when word spread around the site, everyone thought it was a wind-up."

Later on, Usher had a dance-off with the 68 year old former Beatles member on stage.

The three day event which ended on April 17th saw headline sets from King of Leon, Arcade Fire and many others.

SOURCES: Bang Showbiz via Yahoo!UK; MSN Celebrity; Image