"The Lady Is a Tramp" is a show tune from the 1937 Rodgers and Hart musical Babes in Arms in which it was introduced by former child star Mitzi Green. This song is a spoof of New York high society and its strict etiquette (the first line of the verse is "I get too hungry for dinner at eight..."). It has become a popular standard.

Early recordings from 1937 include one by Tommy Dorsey and His Orchestra (featuring Edythe Wright on vocals), Midge Williams and Her Jazz Jesters, Sophie Tucker, and Bernie Cummins on the Vocalion records label (#3714). Lena Horne recorded the song with the Metro-Goldwyn-Mayer Studio Orchestra on March 30, 1948. Her performance appeared in the film, Words and Music, a fictionalized biography of the partnership of Rodgers and Hart. The song was also used in the film version of Pal Joey starring Frank Sinatra, Rita Hayworth and Kim Novak. Joey Evans (Sinatra) sings the song to Vera Simpson (Hayworth) as he tries to entice the wealthy widow Simpson into financing Evans's dream of owning his own night club. It was recorded by Frank Sinatra, Ella Fitzgerald and Pat Suzuki in the 1950s and Shirley Bassey in the 1960s, becoming a signature song for Sinatra. Sinatra sung the song with new lyrics as "The Gentleman Is a Champ" at tribute events for Spiro Agnew and Orson Welles. Diana Ross and The Supremes recorded a new cover in the 1960s too. Buddy Greco's version was a million seller in the 50s. Deana Martin, daughter of Dean Martin, recorded "The Lady Is a Tramp" in 2006. The song was released on her album Memories Are Made of This in 2006 by Big Fish Records.

...
Wikipedia