George Clooney thinks parenthood will "be an adventure"

He said: "We are really happy and really excited. It's going to be an adventure. We've sort of embraced it all with arms wide open."

And the 'Monument's Men' star says his friends were "very supportive" of the news, despite having given him a hard time at first.

He added to French programme 'Rencontres de Cinema': "Then it got really quiet, and they all just started making baby crying noises. And the whole table just busted up laughing."

Meanwhile, a source previously claimed the 'Money Monster' actor was "excited but nervous" about becoming a father.

The insider said: "George is excited but nervous. He is excited about the kids, but also has the normal amount of nerves that come with being parents ...

"Amal strikes me as someone who'll be a fantastic mother. Intelligent, loving, funny, smart, nurturing. She doesn't seem someone who will let kids get away with being Hollywood children."

And it's not a surprise that George might be feeling nervous as his pal Matt Damon recently joked he doesn't know how "anyone" could bring up twins.

He said: "[George] said to me, 'Well, you have four.' And I said, 'Yeah, but not at once!' We did it one at a time. I don't know how anybody does twins. Those sleepless nights ... and there's two of them? There's just no way. But we'll see."

Matt was one of the first people to know about the impending arrival as he recently revealed George told him before the 12 weeks mark.

He shared: "I was working with him last fall and he pulled me aside on set and I mean, I almost started crying. I was so happy for him. And I was like, 'How far along is she?' And he goes, 'Eight weeks.'

"[I said,] 'Are you out of your mind?! Don't tell anybody else! Don't tell anybody else! Don't you know the 12-week rule?' Like of course he doesn't. 'Just shut up, man.' And then four weeks later, I'm like, 'We're good right?' [George confirmed] 'We're good.'"