Cartoon voice actor Bob Bergen confirms my deduction that the voice of Petunia Pig in that clip is Kathleen Helppie.
Huffington Post columnist Bob Elisberg writes that Gigi is on Turner Classic Movies later today. This is for those of you who can get into the story of a bored (and boring) rich guy who decides to brighten his life by purchasing an underage mistress.
You can also watch Gigi to see how many times you can find actors who have been redubbed by Paul Frees. Very near the beginning of the film, there's a scene where Louis Jordan talks with three gentlemen and each one has Paul's voice coming out of his mouth.