The actress brought her three-year-old son to the set of filmmaker Alfonso Cuaron's new sci-fi film, in which she and Clooney play astronauts in space, and admits her little boy took a liking to her co-star.
She says, "My son thinks he's (Clooney) a very cool dude. If there's a choice between me, George and Alfonso, my son will leave me to be with George and these guys."
Single mum Bullock, who adopted Louis in 2010, admits her son has been bonding with a number of her A-list pals.
Speaking at a press conference at Canada's Toronto International Film Festival, she adds, "He's a boy's boy, so he has to go talk to the men. The cute little anecdote is that he went to me and said, 'Where's George and (Cindy Crawford's husband) Rande (Gerber)?' I said, 'I don't know!' And he said, 'I need them.' So we went and found them, and they had man time. And I sort of stood off to the side and waited for them to finish. Then I was allowed to take him back."