Who sang song Judy in disguise?

The most famous version was by Johnny Tillotson.

This song, however, has nothing to do with Cary Grant.

For decades, people have "imitated" Cary Grant by saying the phrase, "Judy, Judy, Judy!" This puzzled Grant himself, as he never said that phrase in either a movie or in real-life. The closest to this would have been the film Only Angels Have Wings , in which his character meets a long-lost love, Judy MacPherson.