Does anyone else remember 'Brittany' from Alvin and the Chipmunks? She was Alvin's girlfriend. Anyhow, I have this image of her singing that song: "It's my party and I'll cry if I want too.." over and over and over again. Joy.
kimi:
Sing a few verses of It's a Small World. It will get the other song out of your head 
anjali:
Ahh.. the classic earworm remedy.. yeah, tried that already! :o)