Nichola and I can't remember who else were naked during the body painting in BB1.
Helen, Amma and Elizabeth were topless/naked in the bath in BB2. And Penny dropped her towel in the shower.
Jade was topless when they played strip something-or-other in BB3.
Shell mowed the lawn in the nude in BB4.
And I think Michelle was topless apart from a couple of tiny stars in BB5.
I may have forgotten some!