We all know Downton Abbey's plots are shrouded in secrecy.
Much to our irritation, and the irritation of period drama fans across the globe, we know next to nothing about what's going to happen at the Crawley's country pile until we see it for our own eyes on the telly.
The stars of the show are notoriously cagey and scripts are kept under lock and key...
But it seems new cast member Richard E Grant didn't get the memo.
The Girls, Doctor Who and Withnail and I star, who is appearing in the upcoming series of the hit ITV period drama , took to Twitter last week to share images of himself on set.
And the show's creator Julian Fellowes was less than impressed by the breach. In fact, it seems he's given Grant a bit of a telling off.
"He's very naughty," Fellowes said of Grant's tweet. "The trouble we've had with things like Twitter."
"We had to explain to the cast about the dangers of tweeting as no one realised how interested everybody was in the show," he told the Telegraph. "You’re in a bubble when you’re filming. You’re just tweeting these nice things and you don’t realise there are millions of people worldwide trying to pick up the plot."
Fellowes can't have been that annoyed though, as he was at the launch of Grant's new Liberty perfume Jack at the time.
Grant has previously broken Downton's code of silence to reveal that his character Simon Bricker is an art historian.