Credit: Jason LaVeris/FilmMagic

That'll keep her on her toes! A few days after Us Weekly officially broke news of Kaley Cuoco's engagement to boyfriend of three months Ryan Sweeting, the Big Bang Theory actress says the proposal shocked her, too -- particularly since Sweeting wasn't exactly being a sweetheart the night of the proposal!

"He actually started a little fight with me and threw me off," Cuoco, 27, tells Entertainment Tonight. "I was like 'Oh my God, things aren't great,'" the CBS star added of her tennis hunk, 26.

The evening obviously improved. "He surprised me at the end of the night ... [when] he popped the ring out. It was amazing."

The never-married star went on to gush to ET about her husband-to-be, who she's been dating since late summer. "From day one I just knew immediately and it's been magic. We have all the same family friends. We grew up with the same people, we just never met. So I kind of feel that I've known him my whole life."

"I know that it seems a little crazy on paper," she admits. "But it's what works for us."