The celebrities have been told that the show is airing in Japan as well as the UK and that it has become a huge ratings success.
Big Brother has informed the housemates that they now have a cult following due to their overnight success and are all now "big in Japan".
They will be tricked into thinking a Japanese TV show called Super Chat has come to interview them in the house.
One housemate will be in on the hoax and must choose the three most gullible housemates. The rest of the house will then have to convince the chosen housemates that the task is real.
They will only pass the task if they successfully get the chosen three to complete outrageous stunts as part of their interviews.
If housemates successfully pass their task, they will be rewarded with a karaoke party, sushi and alcohol for the evening.