LOS ANGELES (FOX NEWS) -- "Big Bang Theory" star Kaley Cuoco is engaged after boyfriend Karl Cook popped the question on her 32nd birthday.

Cook, a professional equestrian rider, revealed the happy news with an emotional Instagram post showing Cuoco’s reaction to his proposal.

The clip shows an overwhelmed Cuoco crying while cradling her head in her hands.

Cook’s post was captioned: “Well after nearly two years I finally got up the courage to ask her to marry me. This is the best night of my life and I think the video shows it is the best night for Kaley as well.”

The 26-year-old Cook can be heard asking the star: “What’s on your finger, honey?”

Cuoco replies: “We’re engaged.”

But then Cook reminds her: “You still haven’t said yes yet.” She, of course, said an emphatic "yes!"

A post shared by Karl Cook (@mrtankcook) on

Cook also posted an image of the dazzling pear-shape diamond engagement ring, which drew awe-struck comments from fans.

Cuoco and Cook have been together since late 2015.

A post shared by Karl Cook (@mrtankcook) on

The star was previously married to professional tennis player Ryan Sweeting, but the union ended in a bitter split after 21 months.
Cook is a professional equestrian and the son of Intuit co-founder Scott Cook. Cuoco has starred as Penny on "The Big Bang Theory" since the sitcom's debut in 2007.

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