George Clooney has branded Brad Pitt a "brutal" prankster.

The 'Ides of March' actor revealed the 'Fight Club' star was particularly crafty when he and Matt Damon used to play tricks on each other during filming for 2001 movie 'Ocean's Eleven'.

George told Parade magazine: "My friends are rough on me. Brad Pitt's brutal, and Matt Damon.

"My friends used to change my outgoing phone message all the time. This was the old days, when you had a phone machine. They would change the message to something horrible and there was nothing I could do to change it back. That was always brilliant."

The 50-year-old star - who is currently dating former WWE wrestler Stacy Keibler - admitted to playing a few pranks of his own and some that have "taken years" to pull off.

He added: "You set a bit of a trap and then you watch it slowly unfold. I've had ones that have taken years."