In scenes yet to be aired, Luisa jumped into the tub with the N-Dubz star and American model Jasmine Waltz before things turned frisky.
Not only did Luisa put her head between Jasmine's breasts, she also put her face in Dappy's chest.
After licking his nipple for a dare, Luisa told him: "You have the smallest nipples."
Dappy, who has openly spoken about the size of his manhood since arriving in the CBB house on Friday night (3 January), replied: "Yeah but the biggest d*** though."
Luisa and Jasmine then shared a shower and screamed when Dappy attempted to walk in.
Celebrity Big Brother, C5, 9pm, Monday 6 January
Celebrity Big Brother 2014: The full lineup
Copyright: Channel 5