ryan sweeting kaley cuoco sept 2013 gi 'Big Bang Theory's' Kaley Cuoco on whirlwind engagement to Ryan Sweeting: 'I know that it seems a little crazy'She might be thinking with her heart at the moment, but “Big Bang Theory” star Kaley Cuoco swears she’s not completely out of her mind.

“I know that it seems a little crazy on paper, but it’s what works for us,” the actress tells “Entertainment Tonight” about getting engaged after a mere three months of dating. (And following on the heels of her even shorter but highly public fling with “Man of Steel” star Henry Cavill.)

Turns out that she and her tennis star fiance actually have similar backgrounds and more in common than one might initially think.

“From day one I just knew immediately and it’s been magic,” she says. “We have all the same family friends. We grew up with the same people, we just never met. So I kind of feel like I’ve known him my whole life.”