Colbie Caillat and Gavin DeGraw Duet for New Romance Movie [AUDIO/VIDEO]

Singer/songwriters Colbie Caillat and Gavin DeGraw toured together last summer, making beautiful music all across America. Now the product of their time together is 'We Both Know', a romantic new ballad that has become the theme song for the film Safe Haven starring Josh Duhamel and Julianna Hough.

The movie is bound to be a tear-jerker since it was adapted from a Nicholas Sparks novel. It's essentially a reworking of the famous Julia Roberts flick Sleeping with the Enemy.

Listen to 'We Both Know', then watch Safe Haven movie trailer below: