updated 09/30/2013 AT 5:00 PM ET
•originally published 09/30/2013 AT 5:30 PM ET
“[He] actually started a little fight with me and threw me off,” the Big Bang Theory star told Entertainment Tonight’s Rocsi Diaz on Monday.
“I was like, ‘Oh my God, things aren’t great,’ ” Cuoco, 27, admitted. “He surprised me at the end of the night [when] he popped the ring out. It was amazing.”