While Buller was studying drama at the Central School of Speech and Drama, she met love of her life Ben Browder. Ben Browder is also an actor and he is famous for playing John Crichton in Farscape. They got married in 1989. As a husband and wife, they have been parents twice. There is no any sign of them getting divorced. Her nationality is English and she is of white ethnicity. She has an average height.
Buller made her acting debut at the end of 1980s by starring the role of Hospital Nurse in a British television play She's Been Away. On 20th of September 1990, she played the role of Gloria in an American television mystery series Father Dowling Mysteries. In the early 1990s, she appeared in the movies like Fever, Those Secrets, Deceived, and so on. She got her rise in fame as an actress after she portrayed the role of War Minister Ahkna in a military science fiction miniseries Farscape: The Peacekeeper Wars. She is now aged 52 years old and her net worth is in millions.