Mary Berry accidentally revealed the contestant who's leaving 'The Great British Bake Off' tonight (19.08.15).

Mary Berry

Mary Berry

The 80-year-old TV chef - who presents alongside Paul Hollywood - was being interviewed by BBC Radio 2 DJ Chris Evans when she let slip the name of the person who failed to get into the next round.

Speaking on The Chris Evans Breakfast Show Mary revealed that Dorret Conway had failed to make it through to the fourth episode despite the fact viewers won't see her be sent home until the third episode airs tonight (19.08.15).

Chris said: "Well we've already lost two. You don't hang around do you, Mary?"

Mary replied, saying: "Wait a minute, we've lost three."

A confused Chris then added: "Have we lost three?"

Failing to recognise her mistake, Mary insisted: "Yes we have. We lost Mary last week, Dorret and on the first week it was our lovely chap with his little hat on [Stuart]."

Realising the error before Mary had, Chris quickly interrupted and said "you know that but we don't".

He said: "But you've only lost two so far. There's another one tonight, you know that but we don't."

Mary finally cottoned on to her mistake and awkwardly attempted to hide it.

She added: "Oh yeah... then if we lose another one tonight..."

The contestant leaving will be officially announced on tonight's episode at 8pm on BBC One.