Kaley Cuoco at an event for The 74th Annual Golden Globe Awards 2017 (2017)

Kaley Cuoco in The Big Bang Theory (2007)

Kaley Cuoco and Johnny Galecki in The Big Bang Theory (2007)

Karl Cook and actor Kaley Cuoco attend 19th Annual Post-Golden Globes Party hosted by Warner Bros. Pictures and InStyle

Kaley Cuoco at an event for The Big Bang Theory (2007)

Kaley Cuoco, Johnny Galecki, and Jim Parsons at an event for The Big Bang Theory (2007)

Kaley Cuoco and Simon Helberg in Pilot (2007)

Kaley Cuoco and Jim Parsons in The Big Bang Theory (2007)

John Ritter and Kaley Cuoco in 8 Simple Rules (2002)

John Ritter, Kaley Cuoco, and Amy Davidson in 8 Simple Rules (2002)

John Ritter, Katey Sagal, and Kaley Cuoco in 8 Simple Rules (2002)