George Clooney may be a happily married man, but the Oscar-winning actor has revealed that his wife Amal Alamuddin left him waiting when he asked her to marry him.

Speaking to CBS This Morning, 53-year-old Clooney revealed the details of his proposal and the fact the Alamuddin didn't immediately say yes.

Clooney explains: "When I asked her...we had never talked about it...there wasn't, like, 'Hey, maybe we should get married.' I literally I dropped it on her. She just kept saying, 'Oh my God' and 'Wow.' And we just sat there. 

"Finally, I just said, 'Listen. You know, I'm 53,' at the time, or 52, I think, at the time, and I said, 'You know, I've been on my knee now for about 28 minutes. So I gotta get an answer out of this, 'cause I'm gonna throw a hip out'," he joked.