This is from Dan in Real Life - It's a very easy song to play and I just listened to the 
and wrote what I heard from the movie, they may not be perfect. Have fun, this song is hilarious.

B, F#, A, E (Throughout entire song)

Ruthie Pigface Draper, Ruthie Pigface Draper

There's a girl coming over here, she's on her way right now

She's driving here to meet Danny

What's Her name?

Ruthie, Pigface, Draper

(Ruthie) She's living in a house of bricks, not straw or sticks

I'll be your big bad wolf, I love your cute curly tail

This little piggie went to market, this little piggie stayed home

This little piggie had roast beef, this little piggie had none

Wee, wee, wee, wee, wee, wee, wee, wee, wee, wee, All the way home!