The duo have been forced to wear special outfits to remind them about the strict rules when it comes to discussing the subject.
Lauren is wearing a T-shirt with 'Don't Trust Me' on it. Meanwhile, Sara's outfit sports the words: "I talk about nominations."
"Don't trust me'? Thanks, Big Brother, this is really going to help me!" said Lauren afterwards.
The duo's rule-break follows the punishment from earlier this week, which involved the hot water being turned off after Deana Uppal, Sara and Luke Anderson spoke about the face-to-face nominations.
Big Brother continues daily on Channel 5. Lauren faces Luke A in this week's public vote.