Williams was for diapers to see as a small child in several commercials. She attended primary school at the Lycée Français in Los Angeles and then completed the Beverly Hills High School, graduating in 1988. A spectacle agent saw her in a school production of Romeo and Juliet, and took them under contract. She is married to the author Ajay Sahgal. The couple has three children.
She began her career in 1989 as a friend of Christopher Daniel Barnes on the sitcom Day by Day on NBC. She became known for her role as Lindsay Dole on the television series The Practice and as Dr. Natalie Durant in the TV series Medical Investigation. In the series Men in Trees, she appeared as Juliet. In the first season of the sitcom Scrubs - she appeared in a supporting role as a student Kristen Murphy. From 2009 to 2011 she played a main character in the series Lie to Me