The duo were put in jeopardy by an unwitting Jim Davidson and Linda Nolan as part of the handcuff twist.
Davidson and Nolan, who entered the house first, were given the option of uncuffing one pair of housemates after meeting everyone.
They eventually chose to grant freedom to Dappy and Jones because they seemed "stressed", but were surprised to find out that it meant that the duo now face the first eviction on Wednesday.
Two more pairs of housemates will also join them in facing eviction from Monday.
The other celebrity duos who entered the house tonight are Sam Faiers and Jasmine Waltz, Lee Ryan and Casey Batchelor, Ollie Locke and Lionel Blair, and Luisa Zissman and Evander Holyfield.
Celebrity Big Brother continues tomorrow (January 4) at 10pm on Channel 5.
Take a look at the gallery below as the stars entered the house: