Baby, It's Cold Outside

From Muppet Wiki

Written by	Frank Loesser
Music by
Lyrics by
Date	1949
Source	Neptune's Daughter
Publisher	Frank Music Corp.

"Baby, It's Cold Outside," is a popular duet in which one singer attempts to convince the other to stay rather than going home through a snowstorm. It was performed in episode 213 of The Muppet Show as a duet between Miss Piggy and a reluctant Rudolf Nureyev. In contrast to the original song, the attempted seduction took place inside a steam room, allowing for comic irony and a chance to show Nureyev in a towel.