08/12/2014 15:42 GMT | Updated 20/05/2015 10:12 BST

It's George Clooney In Downton Abbey!

Shortly before Downton Abbey returned for its fifth series in September, we heard George Clooney was to make an appearance in the hit ITV show.

Finally, there's evidence that George Clooney really has been hanging out with the Crawley family. Hurrah!

Text Santa

The 53-year-old actor joins Downton star Hugh Bonneville in a photo taken from the set of the Text Santa fundraising special.

George and Hugh, who worked together on the film The Monuments Men, can be seen posing in matching grey suits - but ITV has also given us a sneak preview of the Clooney episode with this 19-second clip....

He looks quite at home, doesn't he?

Turns out, the rest of the cast didn't even know the Hollywood star would be making a cameo appearance.

MORE: Downton Abbey's Lady Grantham kissed George Clooney!

"It was amazing. We didn't know if it would actually happen until he turned up," Laura Carmichael, who plays Lady Edith Crawley, told The Mirror.

"We were filming and then heard, 'He's here! He's here! He's arrived!'"

Text Santa

Earlier this year it was reported that Clooney and his fiancée, Amal Alamuddin, considered choosing Highclere Castle, the Hampshire estate where Downton Abbey is filmed, as the venue for their wedding.

MORE: George Clooney and Amal Alamuddin's wedding pictures revealed

However, it's thought this was just a cover story to keep his Downton appearance a big secret. Clever.

Love George? Who doesn't? Flick back through his style evolution below:

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