Is the eldest of three children of Danny Thomas and Rose Marie Mantell Thomas.
Her sister Terre Thomas, her brother Tony Thomas and her father Danny Thomas all appeared on the That Girl (1966) episode, That Girl: My Sister's Keeper (1969).
Remained friends with That Girl (1966) co-star Ted Bessell until his death. Thomas insisted Bessell see a doctor (which he did), when he complained of chest pains only days before he died.
Has Lebanese and Italian origins. Her father was Lebanese and her mother was Italian. Her mother's maiden name was Rose Marie Cassaniti.
Future successful television producer Aaron Spelling wrote the script for one of her very earliest television roles, an appearance with her father Danny Thomas on the anthology series Zane Grey Theater (1956) telecast on February 2, 1961: Zane Grey Theater: Honor Bright (1961).
Godmother is Loretta Young.
She studied drama at HB Studio in Greenwich Village, New York City.
St. Jude Children's Research Hospital national outreach director.
Thomas and Donohue, long-time residents of Westport, Connecticut sold their sprawling Long Island Sound estate for close to its asking price, just under $30 million, moving to a smaller property across town. [December 2006]
Best known by the public for her starring role as the wholesome Ann Marie on That Girl (1966).
Attended and graduated from Marymount High School in Los Angeles, California (1956).
Attended and graduated from the University of Southern California with a teaching degree.
She was a member of the Kappa Alpha Theta sorority.
She was awarded the Women in Film Lucy Award for her excellence and innovation in her creative works that have enhanced the perception of women through the medium of television (1996).
She was awarded the Presidential Medal of Freedom by President Barack Obama on November 24, 2014, the highest honor bestowed upon a civilian, at a White House ceremony.
Shares the same birthday with Laurence Luckinbill.
Lifelong friends with Gloria Steinem.