Stars of Downton Abbey alongside writer and creator Julian Fellowes walked the red carpet for a charity screening on Wednesday September 17.
It came ahead of the new season's launch on British TV.
Producers confirmed they had spent a day filming with George Clooney who made what producers described as 'a cameo appearance'.
Star Laura Carmichael didn't give much away about working with the Hollywood A-lister.
SOUNDBITE, Laura Carmichael, saying (English):
"It's very exciting. That's all I'll say."
Despite its quintessentially English subject matter, "Downton Abbey" has proved to have a universal appeal, airing in 250 territories worldwide, and proving a particular hit in the US and China.
SOUNDBITE, Hugh Bonneville, saying (English):
"I think yes of course it's all about a perceived idea that we are all very buttoned up and reserved and don't really express our feelings. If we did the show would be over very quickly. Usually it's about th
