I love the movie "Mean girls"!

I think its a well done movie and Lindsay Lohan is an very good actress.. And Jonathan Bennett is sooooo cute!!

I want to know if anyone of you know whats the name of the background song which is played in the end of the movie when Jr Plastics arrives and you see Cady giving this smile and then the list of actors and such starts rolling?
I love the song but I just can't find it. Its wuite a background song, no one is really "singing" it. Its a voice who is in the song. Quite hard to explain.. I hope someone of you know the name of it! :-)