Tobin's stage debut came in 1912 in Disraeli.[2] She appeared in a few films as a child and formed a double act with her sister Vivian. Their brother, George, also had a brief acting career. Following her education in Paris and New York, Tobin concentrated on a stage career in New York.[citation needed]
Although she was seen most often in comedies, she also played the role of Cordelia in a Broadway production of King Lear in 1923. Popular with audiences, she was often praised by critics for her appearance and style rather than for her talent, but in 1929, she achieved a significant success in the play Fifty Million Frenchmen. She introduced and popularized the Cole Porter song "You Do Something to Me", and the success of the role led her back to Hollywood, where she performed regularly in comedy films from the early 1930s.[citation needed]