George Clooney is to star in a special episode of Downton Abbey.
The actor will appear in a sketch for charity fundraiser Text Santa.
But the 53-year-old will not feature in a full series or Christmas episode, an ITV spokesperson confirmed.
It has been reported that Clooney will play an American guest at a wedding being held at the famous estate owned by the Crawley family.
ITV declined to reveal any more details about his planned role.
Clooney may be reunited on-screen with his friend and former Monuments Men co-star Hugh Bonneville, who plays Lord Robert Crawley.