George and Brad Pitt at war over their looks

George Clooney appeared on the Late Show with David Letterman

George Clooney ribbed Brad Pitt about losing out to him for the title of "World's Sexiest Man" as he appeared on the Late Show with David Letterman.

Pitt poked fun after Clooney won the People magazine title by taking out two full-page adverts in Hollywood papers, showing Clooney in an unflattering 1980’s shot, congratulating him and signing the ads "The Reverend Ted."

But Clooney struck back at his Ocean's Eleven co-star on Letterman by showing some of Pitt's early publicity shots, adding jokingly: "He has won two and I’ve won two. We campaign hard - Brad worked hard but I think he got some bad advice."