At the age of 12, Porter arrived at Hollywood and was discovered while taking dancing lessons at the Fanchon and Marco dancing school. Beginning with a bit parts in movies such as The Adventures of Tom Sawyer (1938) and One Million British Columbia (1940), she eventually established herself as an actress for Metro-Goldwyn-Mayer in 1941. While never a big star, she was active throughout the 1940s, appearing in almost 30 motion pictures alongside stars like Esther Williams, Mickey Rooney and the comedy duo Abbott & Costello.
In the 1950s Porter appeared mainly in television series such as The Red Skelton Show and 77 Sunset Strip.
She retired from acting in 1961.