- 'Celebrities that were big in the 1930s appeared in the Betty Boop cartoons and would often perform their hit song or hit songs that were popular in the 1920s-1930s.
Ethel Merman appeared in Time on My Hands where she sung the title of the cartoon & You Try Somebody Else where she performed Sweetheart.
Rudy Vallee appeared in Betty Co-Ed, Kitty From Kansas City, Musical Justice, Rudy Vallee Melodies and finally in Poor Cinderella.
Cab Calloway appeared in Minnie the Moocher, Snow White and The Old Man of the Mountain. He performed songs in all three cartoons.
Arthur Jarrett appeared in Just One More Chance and Popular Melodies where he performed "My Silent Love" and Betty Boop's theme song Sweet Betty.
Maurice Chevalier has a small cameo in Stopping the Show where he tells Betty Boop to impersonate him and right now. Maurice was a fan of the series, his hit song "Hello Beautiful" was featured in My Wife's Gone to the Country & Bimbo's Express in 1931. He has a small cameo and is imitated by Betty Boop in the 1932 cartoon Stopping the Show.
Irene Bordoni performs the title song in Just a Giggolo. Betty introduces her by saying "Let's give little Irene a great big hand!"