Amy Poehler would be PERFECT. I knew Elle's mom reminded me of someone.
I have to say, I think a movie musical of Legally Blonde would be a baaaad idea... but I'd probably go see it anyway. And buy the soundtrack. (Whoa, that's something new-- an instance when I can actually appropriately use the word 'soundtrack'! )
In my pants, she has burst like the music of angels, the light of the sun! --Marius Pantsmercy