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Love is an unpredictable thing -- even for George Clooney.

The "Hail, Caesar!" star stopped by "Ellen" this week (fun fact: the show is taped on the same sound stage once used for "ER") and Ellen DeGeneres wasted no time asking for the scoop on George's proposal to his wife, Amal.

Turns out Hollywood's longtime favorite bachelor knew he wanted to marry the human rights lawyer within about six months. But they didn't discuss marriage before he started putting proposal machinations into place -- which might explain why they didn't exactly go as he expected.

"I plotted the whole thing out," he admitted (via Us Weekly). "I had the ring hidden behind her. Everything was planned out and I've cooked dinner. And she comes in and she's just come back from London. And usually she'll dress up, and now she's like, 'Maybe we'll just order in.' And I go, 'No, no, no, I've made dinner.'"

The song he'd planned to have playing, "Why Shouldn't I," by his aunt Rosemary Clooney, came on the dial. And she proceeded to get up and start washing dishes (which she never does, George noted).

Finally, he asked her to grab a lighter from a drawer in the house.

"She's like, 'It's a ring.' Like, as if somebody had left it there some other time," he recalled, his voice mocking her seeming skepticism as the audience cackled with laughter.

"I don't know. And I'm doing all the moves you can do with my face … And I got down on my knee and said, 'I couldn't imagine spending the rest of my life without you.' And she kept looking at the ring, and she was looking at me, and she was like, 'Oh my God.'"

But not "yes." Or even "no" for that matter.

"And we now know, because there was a playlist, how long it actually took, and it was like 25 minutes," he continued.

"Finally I literally said, 'Look, I hope the answer is yes, but I need an answer cause ya know I'm 52 and I could throw out my hip pretty soon. And she said, 'Oh, yes.' And it worked out really well."