George Clooney will appear in a special episode of Downton Abbey. He'll take part in a one-off sketch, as part of the UK's Text Santa charity appeal.
Producers are refusing to give away anything, but insiders have revealed George has already filmed his scenes and will appear alongsideHugh Bonneville and Michelle Dockery.
A source told the Sun: "All the plans have been shrouded in secrecy because George was determined for his role not to leak out.
"All the other cast members and crew were also sworn to secrecy. It's amazing it's taken four months for someone to find out. This is the biggest moment in Downton history and shows it's now the biggest drama in the world."
