biographical article needs additional citations for verification. Please help by adding reliable sources. Contentious material about living persons that is unsourced or poorly sourced must be removed immediately, especially if potentially libelous or harmful. (March 2010) Kristen Johnston Johnston during a PETA event honoring filmmaker Donny Moss, June 2008 Born September 20, 1967 (1967-09-20) (age 43) Washington, D.C., U.S. Occupation Actress Years active 1985–present Kristen Johnston (born September 20, 1967) is an American stage, film, and television actress. She may be most famous for her role as Sally Solomon in the television series 3rd Rock from the Sun. She also starred as Wilma Flintstone in The Flintstones in Viva Rock Vegas. Johnston is 6'0"..