VIDEO: Pierce Brosnan Reacts to Passing of 'Mrs. Doubtfire' Co-Star Robin Williams

In an exclusive interview with ET, Pierce Brosnan spoke about the passing of his Mrs. Doubtfire co-star Robin Williams.

"I never really worked with Robin Williams, to tell you the truth. I worked with Mrs. Doubtfire," Brosnan said of the incredible way the actor transformed himself for the character. "He was a magnificent human being, and a beautiful person."

In the 1993 comedy, Williams starred as a man who lost custody of his children when his wife Miranda (Sally Field) requests for a divorce. In order to be able to see his kids, he wears prosthetic makeup and poses as an elderly Scottish nanny for the household. Brosnan portrayed Stuart, Miranda's rich and handsome new love interest.

Directed by Chris Columbus, the film won the Academy Award for Best Makeup and was placed 67th in the American Film Institute's 100 Years, 100 Laughs: America's Funniest Movies, a list of the 100 funniest movies of the 20th century. It was also rated No. 40 on Bravo's 100 Funniest Movies of All Time.