In December 2009, Stefanie starred as the Fairy Godmother in the pantomime Cinderella. The production was staged at the Mayflower Theatre in Southampton and her co-stars were Christopher Biggins and Matthew Kelly.
Stefanie's producing debut was Family Secrets in 1984. She also starred in it, playing Melissa Gilbert's mother.
Stefanie was given an Honorary Fellowship from Chester Zoo in England, acknowledging her outstanding work in wildlife conservation and protection. She helped to promote the Zoo's Asian elephant appeal and formally opened the Jaguar cars-sponsored Spirit of the Jaguar exhibit in 2001.
In 1995, Stefanie successfully sued the London Daily Mail for libel after they falsely reported that she had sexually harassed a former assistant, Brian Quintana. He had accused her of sexually harrassing him, however the legal case was dropped when it was proven she was out of the country when most of the alleged harrassment occurred. Since then, Quintana has gone on to attempt to sue Paris Hilton citing similar charges.
Stefanie was Robert Wagner's first, and only choice, to play the character of Jennifer in Hart To Hart. Studio bosses had suggested many other more prolific actresses, including Wagner's wife Natalie Wood.
She speaks six languages: English, Polish, Spanish, French, Italian, Swahili and some Mandarin Chinese.
Stefanie has written two fitness books, Superlife and Powers Pilates: A Guide to Longevity and Well-Being Through Pilates.
With the money left in Holden's will, Stefanie established the William Holden Wildlife Foundation, a charity that educates people on wildlife and preservation, based in Kenya.
Stefanie's partner, Hollywood actor William Holden, died on November 16th 1981 when he injured his head after falling at home. Just over two weeks later her Hart To Hart co-star Robert Wagner's wife, Natalie Wood, also died when she fell off their boat and drowned on November 29th.
Stefanie smokes cigars. She was introduced to them at the age of 14.
In 2002, Stefanie appeared in a production of The King And I at the London Palladium.
In 2003, Stefanie released On The Same Page, a CD featuring songs such as Love Me Or Leave Me and Autumn in New York.
On November 25th 1992, Stefanie was honoured with a star at 6776 Hollywood Boulevard on the ‘Hollywood Walk of Fame' for her services to television.
Stefanie attended the same ballet class as Natalie Wood and Jill St John, both of whom have been married to her Hart To Hart co-star Robert Wagner.
At the age of 18, Stefanie was initially billed as Taffy Paul when she was signed by Columbia Pictures.
Stefanie auditioned for a dancing part in the 1961 Hollywood film West Side Story. However, when the producers realised that she was only 15 years of age, she failed in the final round.
Stefanie is a talented polo player. She is a member of the Royal County of Berkshire Polo Club, where Prince Charles is a member. She was also one of the first non-British citizens to be granted membership.
Stefanie graduated from Hollywood High School in 1960.
Stefanie: I have made 27 theatrical films but I am not and never have been a movie star. I am a worker bee, one of those people who act to live, not live to act. As far as my TV work is concerned I am indiscriminate. I found work all the time, and maybe people feel comfortable with someone in their home whom they've seem so many times before.
Stefanie: There is this perverse flaw in my character that makes me feel good to know I can take care of things myself.
Stefanie: I'm very down-to-earth. Beauty isn't something I spend a lot of time thinking about. I wear sunscreen, and I use a Buf-Puf for exfoliation. I did have some laser work done around my eyes and lips for sun damage.
Stefanie: (On her role in Hart To Hart) It's wonderful to be associated with a show that was so well received, It's nice to know that people remember the series with such affection, although I'm still shocked that it was such a huge cult thing.
Stefanie: I am the principal fundraiser and person who sets the curriculum of the Education Center of the William Holden Wildlife Foundation, which functions in Kenya, and we serve over 10,000 students a year.
Stefanie: (On her appearance in The King And I) We've got a wonderful cast of children, some of whom don't speak English. But I speak a little Chinese. I speak a bit of Mandarin and a tiny bit of Cantonese, so I hope my language will improve.
Stefanie: (On rumors about an off-screen relationship with Hart To Hart co-star Robert Wagner) I know there have always been rumors that we were romantically involved, but we never have been. We are still friends, but we don't get to see each other very often. RJ lives in Aspen, Colorado, and doesn't come to London very often.
Stefanie: (On her screen chemistry with Hart To Hart co-star Robert Wagner) If I could bottle it, I could make a fortune.
Stefanie: They say that a good cook can ignite sparks by the way he kisses. The way I see, just because a guy can turn on the stove doesn't necessarily make him a good cook.
Stefanie: When the makeup comes off you still have to go home and face your life.
Stefanie: I began to work at fifteen, and when I was put under contract at Columbia, they still believed in 'grooming' their young hopefuls. That process allowed me to learn how movies were made since the studio was my playground.
Stefanie: (On her relationship with her mother) I have a very good relationship with my mother. We worked out our relationship. I had to work out my perception of her as a human being. She had to work out her perception of me as an adult.
Stefanie: (On William Holden) The most significant human being in my life.