Step inside the diner! “American Idol” and “Smash” alum Katharine McPhee is making her Broadway debut as Jenna in the Sara Bareilles-scored “Waitress” on Broadway. McPhee plays Jenna, the small-town waitress who finds herself pregnant by her abusive husband and discovers an escape in baking. We went backstage with McPhee as she prepared for a performance. Check out our exclusive photos below, and see how the pie gets made!