Kristen Bell and Dax Shepard posed for photos on their way into Nashville's Bridgestone Arena for the CMT Music Awards this evening. It's a big night for Kristen, since she's hosting the show for the second time and making her first official appearance since giving birth to daughter Lincoln on March 28. Kristen will be joined on stage by country star Jason Aldean, and the duo got together earlier today for rehearsals. She's been sharing behind-the-snaps of their preparation on Twitter and also joked about wearing "treacherous heels" since she'll be standing next to Jason, who is over six feet tall. For the red carpet, though, Kristen chose a more sensible pair of heels and a sexy leather dress, while Dax dressed up in a neutral-colored suit.