WATCH: "Big Bang Theory's" Kelly Cuoco is so happy to be getting engaged

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(CNN) -- It was a very happy 32nd birthday for Big Bang Theory star Kaley Cuoco.

This was her reaction to her now-fiance Karl Cook's proposal. He captioned the video with "This is the best night of my life."

The 26-year-old is the son of Intuit co-founder Scott Cook and professional equestrian who began riding when he was 8-years-old.

Cuoco is a fellow rider and jumper and has popped up at equestrian competitions.

She was previously married to tennis player Ryan Sweeting, whom she married in 2013. They split up 21 months later.