This is a beutiful duett preformed by Robert Downey Jr. and Vonda Shepard.
I couldn't find a tab myself so I made one for you all. It's very easy.

Verse: C, Am, F, C     C, Am, Em, F, G (Listen to the song to understand the F and G chords)

Bridge: Dm, C, Dm, G, F, G (Same here , listen to the song to hear the F and G chords)

Enjoy!