Show's contestant's are unaware of the move
The Big Brother housemates are to give their nominations on live TV.
The contestants will pick who faces the public vote on tonight’s special show.
Housemates are unaware of the move, which critics say is to boost falling ratings.
The show will be broadcast on Channel 4 at 10.55pm after the regular show.
Vote lines will open at 10am on Thursday 25th June. Check www.channel4.com/bigbrother for details and terms.