Here's Lucy - Season 1 - Eps 11: Guess Who Owes Lucy $23.50?
Unoriginal Van Johnson episode where Lucy Carter uses a Van Johnson look=alike (played by Johnson, of course) to masquerade as the movie star.
About Here's Lucy

Title: Here's Lucy
First Air Date: 1968-09-23
Last Air Date: 1974-03-18
Status: Ended
Rating: 6.679/10 (from 28 votes)
Language: EN
Seasons: 6
Total Episodes: 144
Network: CBS
Genres: Comedy
Production Companies: Unknown
Cast

Lucille Ball
Lucy Carter

Gale Gordon
Harrison Carter