Christmas came early here on Literally! Katharine McPhee and David Foster join Rob Lowe to discuss their new album, “Christmas Songs,” Rob and David’s decades of friendship, why Rob prefers classic Christmas songs, the surprising origins of the “St. Elmo's Fire” theme, the genius of Celine Dion, and the incredible story of how Rob and David managed to prank both President Clinton and Barbra Streisand.