George Clooney is proud to have been "yelled at" by Frank Sinatra

But rather than being upset by the confrontation with the late singer, George thought it was "great".

He told People magazine: "I remember he was mad at me once because I led this boycott about ... some press freedoms, and he called me because people thought he was sick and there were helicopters flying over his [home], and he called me going, 'It's not working what you're doing!'

"But he was great. I got yelled at by Frank Sinatra!"

The 64-year-old actor worked as Rosemary's driver when he was trying to break into Hollywood and had a great time.

He said: "I remember being on the road. I was my Aunt Rosemary's driver when she was singing.

"And I hadn't known her much when I was young because I lived in Kentucky. She was the Hollywood aunt. So I came out to make a living and I was her driver. And I got to drive [her] and Tony Bennett, and all of these really wonderful singers around for a year.

"I got a really good life lesson in success and failure, and handling it. And I always remember that I felt very lucky that I got that lesson early in time."

The Burn After Reading star - who has twins Alexander and Ella, eight, with his wife Amal - has always found it "helpful" to maintain the friendships he had before he found fame.

He said: "Well, I mean, most of my friends [...] we've been friends for 40 years. I slept on their couch when I was broke. And so they're always around when things and people are giving you too much credit.

"They're the first people to remind you that they're full of c***. That's always helpful. It's helpful to have people that know you long before you were defined by something else, by movies you've done or work you've done and that kind of thing."