Her parents were film producer Wilbur Stark (1912–1995) and New York television host Kathi Norris (1919–2005). She attended a private school in Manhattan, The Hewitt School. She moved to London at the age of 16.
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Her first film role was in the seldom seen comedy farce All I Want Is You... and You... and You... (1974), followed by the equally obscure The Adolescents (1975), opposite Anthony Andrews. She had an uncredited role as a bridesmaid in The Rocky Horror Picture Show (1975). However her best known performance is the lead role in the erotic film Emily (1976). The soundtrack of that film included a title song written for the film by Rod McKuen. She had a lead role in Cruel Passion (1977), a film based on the Marquis de Sade's novel Justine.
Around the same time, she played the part of Camie in Star Wars (also 1977); she appeared in two scenes, both of which were cut from the film before its release. The role of Rost in the Doctor Who serial "Attack of the Cybermen" was meant for her but she allegedly had a disagreement with the production team over her fee and was replaced by Sarah Berger.
She appeared in the comedy film Eat the Rich (1987), and then featured in an episode of the sci-fi TV show Red Dwarf (1989). In an alternate universe, Dave Lister is hugely successful, including being married to a titled wife, Lady Sabrina Mulholland-Jjones, played by Stark.
She was married to Tim Jefferies between 1986 and 1990. She has one daughter, Tatiana (born March 12, 1997) by Warren Walker. Stark lives in London and has been a practising Buddhist since 1994. It was reported in the mainstream UK press in late September 2008 that she had been evicted from her home, was on the verge of bankruptcy, and was living in a hotel in west London by the good graces of the hotel management until her financial situation could be resolved.
In 2002 she was diagnosed with breast cancer, resulting in a mastectomy and chemotherapy. In 2003, she had a second mastectomy. She has founded a cancer awareness agency.
- Internet Movie Database, Emily, imdb.com; accessed 19 February 2016.
- Deming, Mark. "Justine (1977)". AllMovie. Retrieved January 23, 2017.
- Hearn, Marcus (2005). The Cinema of George Lucas. p. 106.
- "Koo Stark's Photography", fashion-planet.com; retrieved October 7, 2007.
- "Prince Andrew's ex Koo Stark speaks about their relationship for first time in 30 years". independent.co.uk. February 15, 2015. Retrieved December 21, 2016.
- "Koo's praise for her daughter's father" The Independent (London), August 18, 1998. Profile, findarticles.com; retrieved October 7, 2007.
- Helen Weathers (July 5, 2008). "Koo Stark: My battle with breast cancer... and why I'm hiding from the bailiffs". Daily Mail. Retrieved April 15, 2011.
- Rebecca Hardy (October 17, 2008). "Homeless and broke – Koo's Stark life". Daily Mail. Retrieved April 15, 2011.
- Bryony Gordon (February 11, 2011). "Koo Stark: From Royal Romance to the High Court". Daily Telegraph. Retrieved April 15, 2011.
- "Chelsea Arts Club secretary signs off with 'lunatic' plea". London Evening Standard. January 17, 2013. Retrieved 15 February 2017.