Watch Kaley Cuoco's Daughter REACT to Big Bang Theory Theme Song

Kaley Cuoco and Tom Pelphrey's daughter, Matilda, reacts to 'The Big Bang Theory' theme song in a video shared on Instagram. Since coming into the world on March 30th, Matilda has stolen her parents' hearts and taken social media by storm. Check out some of her most memorable moments, from twinning with Dad on Father's Day to rocking five different Halloween costumes.