Richard Curtis Director Hugh Grant The Prime Minister Actor Laura Linney Sarah Actor Colin Firth Jamie Bennett Actor Alan Rickman Harry Actor Bill Nighy Billy Mack Actor Emma Thompson Karen Actor Liam Neeson Daniel Actor Martine McCutcheon Natalie Actor Keira Knightley Juliet Actor Rowan Atkinson Rufus Actor Andrew Lincoln Mark Actor Billy Bob Thornton President of the United States Actor Joanna Page Just Judy Actor Kris Marshall Colin Frissell Actor Lúcia Moniz Aurelia Actor Martin Freeman John Actor Thomas Brodie-Sangster Sam Actor Heike Makatsch Mia Actor Chiwetel Ejiofor Peter Actor Rodrigo Santoro Karl Actor Claudia Schiffer Carol Actor Gregor Fisher Joe Actor Olivia Olson Joanna Anderson Actor Abdul Salis Tony Actor Shannon Elizabeth Harriet Actor Denise Richards Carla Actor Sienna Guillory Jamie's Girlfriend Actor Ruby Turner Mrs. Jean Anderson Actor Duncan Kenworthy Producer Tim Bevan Producer Eric Fellner Producer Michael Coulter Cinematographer Nick Moore Film Editing Jim Clay Production Design Craig Armstrong Original Music Rod McLean Art Director Caroline Smith Set Decoration Mary Selway Casting Fiona Weir Casting