Make out alert! Karen (Katharine McPhee) and Jimmy (Jeremy Jordan) are heating things up on stage in the next episode of Smash. As Jimmy's musical Hit List heads to the Fringe Festival, the duo shows off their serious chemistry by performing the ballad “Heart-Shaped Wreckage.” What happened to this couple being “strictly professional?” Despite the Fringe's minimal sets, the number still gets a flashy, romantic makeover complete with wind-blown hair for Karen thanks to the inner-workings of Derek's mind. And if that's not enough for fans rooting for this new couple, they also duet on the rousing tune "This Will Be Our Year." Check out the Smash previews below, and tune in to see how Hit List fares next Tuesday!