The 12 BB contestants have already been taken into hiding, the Sun reports today.

Producers decided to sequester the new housemates last Sunday to ensure they don't find out about the surprises in store.

The move means that by the time they enter the house this Friday, they'll already have been in isolation from friends and family for a fortnight.

A source told the newspaper: “We have deliberately squirrelled away the housemates early because we don’t want them to find out that this year’s theme is Big Brother gets evil. They went into hiding on Sunday. We want them to have a really big shock."