She captioned the photo, "This foundation has saved many lives and kept John Ritter’s memory alive. I’m always thrilled to be part of it."

Cuoco added, "I bid on John’s original Three’s Company cast jacket and won. I was so thrilled and will cherish forever!”

Ritter died in 2003 aged 54 after a "misdiagnosed acute aortic dissection".

Kaley has been open about her close bond with her late friend, who she described as touching "a lot of lives" at an event for his foundation in May 2024.

She has stayed close with his wife, Amy Yasbeck Ritter, and four children Jason, 45, Tyler, 40, Carly, 43, and Noah, 27.

She told PEOPLE magazine, "I will do anything for his wife and his kids. And I'm so really very proud to be here and honoring him."

Kaley recalled how Ritter even used to deliberately "mess up" during "8 Simple Rules" filming just to give the audience an extra laugh.

She said, "He was so funny, and he loved his fans. He was so good. I remember when we were shooting '8 Simple Rules,' [he] used to tell me that he would mess up in front of the audience on purpose to make them laugh.

"And I was like, 'No way!' And then I would watch him mess up over and over when I knew he knew the scenes, and I took that with me for a long time.