I've been looking for the name or artist of this song for days now.
Its from the hills season 4 episode 16.
I think the song is only on the online version
but it goes like this:
"uh-oh Too-morrow we'll pretend that you tooook me home again and know that I don't want you to goooooooooooo."
It played around 17:00 on the online version at the part right after Audrina and her sister got through talking and her sister says "everybody just needs to grow up"
the song plays and then it goes to the part where lauren and lo are talking in the club.