That's right, ladies, the GBBO judge took to Twitter and sent her congratulations to this year's victor... before the show aired.
The new judge tweeted the victor confirming who had been crowned, hours before the show goes out on Channel 4!
She said, "No one told me judging a #GBBO final would be so emotional".
Prue Leith posted the name of the victor on her Twitter feed while travelling in Bhutan, which is six hours ahead of Britain, thinking fans had already seen the last installment. She concluded her post by writing "Bravo" and adding the name of the triumphant baker.
He continued: "Prue Leith has done herself no favours by congratulating the victor some 12 hours before the eagerly anticipated final and has been backed into 6/4 from 15/8 to leave the show".
Obviously upset by her mistake, she told Press Association later: "I'm in Bhutan". The time difference is massive.
"Bhutan is six hours ahead of Greenwich Mean Time", says the BBC helpfully. I'm in too much of a state to talk about it.
Channel 4 has been contacted for comment.
Prue deleted the tweet as soon as she realised.
The other members of the team Paul Hollywood, Prue Leith and Sandi Toksvig, will also be back.
It's all over! The victor of The Great British Bake Off 2017 has been revealed.