Kaley Cuoco attended The John Ritter Foundation for Aortic Health Gala on Thursday, May 9 at the Sunset Room Hollywood in Los Angeles, California to support her late costar. The two appeared on '8 Simple Rules' together and shared a close bond.

Kaley Cuoco exclusively told Us Weekly about her time on '8 Simple Rules' and her favorite memory with late costar John Ritter

The Big Bang Theory 's Kaley Cuoco has paid tribute to the late John Ritter, whom she starred alongside in the sitcom 8 Simple Rules. Cuoco attended the charitable gala 'An Evening from the Heart' in Los Angeles this week, which was presented by The John Ritter Foundation for Aortic Health, and opened proceedings with a heartfelt speech.

Kaley Cuoco will always hold her memories of the late John Ritter close. “He was very special to me,” she told Access Hollywood of her “8 Simple Rules” co-star at The John Ritter Foundation’s “An Evening From The Heart” event.

Kaley Cuoco learned not to "take herself seriously" after working with John Ritter on '8 Simple Rules in the early 200s.

John played Kaley's father on the sitcom 8 Simple Rules For Dating My Teenage Daughter - until his shock death of an aortic dissection in 2003, aged just 54, leaving her grief-stricken.

Kaley Cuoco is remembering her late co-star and onscreen dad, John Ritter, who sadly died back in 2003. The star, 38, attended the John Ritter Foundation for Aortic Health's Evening from the Heart Gala on Thursday (Friday in Australia) in Los Angeles,