Her talent and her warmth have established JULIANNE MOORE as one of Hollywood's finest actresses. She's starring in the new HBO film "Game Change," in which she takes on the role of controversial politician Sarah Palin. She's telling Ellen how she transformed into the former Alaska Governor, and what she learned about her along the way!

Then, from "Rent" to "Wicked," IDINA MENZEL has headlined on the best cast recordings of our generation and staked her claim as an A-List Broadway diva. She's here to discuss her new PBS concert special, "Barefoot at the Symphony," and what life is like with her young son and her husband, Taye Diggs!