Anyone familiar with Macy's songs??!?

Ok, I work at Macy's in Roseville, Minnesota. They play the same songs in the same order every single day, but there's one song I really know nothing about that I want. Here are some clues... The song is a duet. Guy and girl. Its a very well harmonized duet. They both sing through the entire song. Its a love song, but its pretty upbeat. Kind of a retro-pop song. The only lyrics I know is at the end of the chorus, and it goes like this: Cuz its you, cuz its me, in love." If you have any idea what this song is, PLEASE tell me!