23-year-old Miss India UK Deana will face off against the 25-year-old professional dancer in this week's eviction.
It is the second time that Lydia has faced the public vote, after she was nominated in the first week.
The announcement was revealed on the show's official Facebook page earlier this evening (June 25).
The reactions to the nomination result will be shown on tonight's episode of Big Brother's Bit on the Side at 11pm on Channel 5.
Voting for this week's eviction is currently open online via the Channel 5 website.
Deana has recently stated that she feels "bullied" in the house, following the 'Confusing Cuisine' task.