Can't remember the name of this duet. Please help?

I can't remember any of the lyrics but I remember it's a boy and a girl. They were young, but not very young. Maybe around 17 or 18. The girl was beautiful, if that helps. It was a slower song, not rap or anything. It was a very good song and they both had higher voices. I dont think it was too long either, maybe 3 minutes.I know im not giving you much to work with but any help would be greatly appreciated. Thanks in advance.