Hijackers look for Brain of Big Brother

Celebrity hijackers Nicole Appleton and Melanie Blatt began to put the housemates' skills to the test this afternoon.

Talking to the house, the singers explained: "We've been watching you all show off your talents, but what we'd all like to see is how much you know about your area of expertise."

The housemates grew excited at news of their task, dubbed 'the Brain of Big Brother'.

The challenge will involve the All Saints stars inviting the housemates one by one to the Task Room and firing questions at them to determine who best knows their area of expertise.