Paul Feig Director Emilia Clarke Kate Actor Henry Golding Tom Actor Michelle Yeoh Santa Actor Emma Thompson Petra Actor, Screenwriter, Producer Rebecca Root Dr. Addis Actor Lydia Leonard Marta Actor Patti LuPone Joyce Actor Madison Ingoldsby Young Kate Actor Ingrid Oliver Police Woman Crowley Actor Rob Delaney Theater Director Actor Peter Serafinowicz Theater Producer Actor Fabien Frankel Fabien Actor David Mumeni Guy in Pub Actor Jade Anouka Alba Actor Ritu Arya Jenna Actor Boris Isakovic Ivan Actor Maxim Baldry Ed Actor Margaret Clunie Shower Sarah Actor John-Luke Roberts Klaus the German Clown Actor Bilal Zafar Oscar Actor Peter Mygind The Dane aka 'Boy' Actor Bryony Kimmings Screenwriter Erik Baiers Producer Jessie Henderson Producer David Livingstone Producer Sarah Bradshaw Executive Producer John Schwartzman Cinematographer Brent White Film Editing Theodore Shapiro Original Music Gary Freeman Production Design Richard Hardy Art Director Raffaella Giovannetti Set Decoration Olivia Nelson Set Decoration Renee Ehrlich Kalfus Costume Design Alice Searby Casting Fiona Weir Casting