After giving housemates a taster of it last week, Stevi decided that not everyone had a good enough look at the neon green piece.
Stevi wanted to "shock" Bobby and he certainly did that as he entered the bathroom wearing the mankini and a long blonde wig before joining Bobby in the bath.
Bobby's reaction? "Stop! Stop filming."
But, taking it in his stride, Bobby actually found Stevi's getup quite funny, even pretending to throw up.
He added: "You sit up that end. Oh, bloody hell. That is disgraceful. It's like being in the bath with one of those rock stars!"
Thankfully, CBB censored the most revealing parts of Stevi's mankini, but we have a feeling this won't be the last we'll see of it. After all, this is the same mankini Stevi wore in the X Factor house last year!
Watch the full video here.
CBB airs nightly on Channel 5.
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Copyright: Channel 5