Billo, who was presenting Sky's Italian coverage of the draw in Switzerland, was speaking to Leonardo about PSG's quarter-final pairing with Barcelona when she asked him if he had any questions for the studio panel.
The former Brazil midfielder, a former AC Milan and Inter coach, leapt on the opportunity, saying: "Anna, do you want to marry me?", surprising a clearly embarrassed Billo.
"Do you want to marry me? You have to answer me now. I'm waiting for your answer. It's not that difficult," he said.
The shocked but smiling Billo stuttered: "OK... we'll see."
While going to an advert break her microphone remained on and fanning herself with a piece of paper, Billo said: "He's gone mad."
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