'The first year or so we were dating, we wrestled a lot with, you know, my past,' says Shepard, who also wrote and directed the movie.

By Kara Warner

Dax Shepard in "Hit and Run"

Photo: Open Road Films

Kristen Bell and Dax Shepard are putting their love on the line, so to speak, for the sake of their upcoming action-packed R-rated comedy "Hit and Run."

The plot revolves around former getaway driver Charlie Bronson (Shepard), who busts out of the Witness Protection Program to drive his girlfriend (Bell) to Los Angeles so she can land her dream job. Their road trip becomes increasingly complicated and dangerous when they are chased by the feds (led by Tom Arnold) and later Charlie's former gang of criminals (led by Bradley Cooper).

When MTV News caught up with the fun-loving, real-life couple recently, they provided expert teasery and commentary as to why...