George Clooney will appear as a guest star in the hit UK series "Downton Abbey," where he will be portraying the role of an American wedding guest in the country estate.

A spokesperson for "Downton Abbey" confirmed the news and revealed that Clooney will be a part of the series' Christmas charity fundraiser, "Text Santa," which is set in Highclere Castle, the location of the series, according to US Weekly.

""Text Santa" aims to raise money and awareness for six UK-based charities offering life-changing services to people in communities," Telegraph UK noted.

Last year, some of the charities handpicked included Age UK, Barnardo's, BeatBullying, British Heart Foundation, CLIC Sargent and Help the Hospices, the same publication confirmed.

At present, very little is known about Clooney's involvement in the series but it has been revealed that the actor has also shot his scenes for the show. He will be appearing alongside Hugh Bonneville and Michelle Dockery, but will not be part of the entire Christmas episode, The Guardian reported.

Clooney is a self-confessed fan of "Downton Abbey" and he also happens to be good friends with the show's star, Bonneville, who plays the role of Lord Robert Crawley, the same publication noted.

Earlier this year, there have been reports that Clooney and his fiancée, Amal Alamuddin, have considered the Highclere Castle as the venue for their upcoming wedding.

However, multiple sources later on clarified that the news served only as a cover up to the fact that Clooney was at the castle because he was filming for "Downton Abbey."

"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," a source dished.