Together on Graham's sofa tonight: a first-time appearance for Pretty Woman and Erin Brockovich star, Julia Roberts, promoting her new film, Leave the World Behind, twice-Oscar-winning Hollywood great Tom Hanks, talking about his epic London installation The Moonwalkers: A Journey with Tom Hanks, Dune star Timothée Chalamet, in new Charlie and the Chocolate Factory prequel Wonka and music legend Cher, chatting and performing her current single, DJ Play a Christmas Song.