OK, Eartha Kitt [wiki] wasn't French so officially she doesn't belong here, but one of her most famous songs was French so that's some justification. Here's she is, performing C'est si bon [wiki], with the original French lyrics by André Hornez.

[youtube]aQF7C6LxE_s[/youtube]
One of the charms of this song is that, like many Anglophones, Kitt couldn't pronounce the letter 'u' the way the French do. So when she's supposed to sing Bras dessus bras dessous, it comes out as twice Bras dessous. Never mind, rest in peace, Eartha!