WHAT SONG IS THIS?!?!!?!?!? PLEASE HELP 10 POINTS BEST ANSWER!?

I'm 90% sure it's from a movie but I could be completely wrong. It's a man and woman duet-it's about love (95% sure at least). When I heard the song at school I thought I've heard it before-just don't know where, when, and how..

Well, today I remembered some of the melody (now I forgot..) but I wrote down, "doo, doo, doo, dooo. What have we now" I'm pretty sure the guy sang, "What have we now"

HELP PLEASE!

I asked this question before and I got people like Justin Timberlake and the Pussycat Dolls-just a hint please nothing like that. But if you think it is feel free to write those down! After all it could be the right song and you might get 10 POINTS FOR BEST ANSWER or you could just get those 2 points hah.

HELP HELP HELP.