First big row in the Big Brother house after Mikey wears Sylvia's knickers

Sylvia, 21, was furious with the Scot and soon the whole house was aware of her fiery temper.

The religious student unleashed a tirade on the 33-year-old radio producer when she spotted him wearing her peach-coloured knickers.

Knickergate: Sylvia lets rip at Mikey after discovering he is wearing her underwear

Earlier in the evening, Sylvia, together with Jennifer and Alexandra, had already clashed with the 'stags' after they refused to don bunny outfits to entertain the 'groom' Mario ahead of his faux wedding to Stephanie today.

After the girls refused to 'demean' themselves in the sexy ensembles, Mikey, Dale and Dennis happily wore the bodices and matching cuffs for the riotous stag in the garden.

As the night grew darker, the stags took the party into the bathroom, as the bedroom was strictly out of bounds and for the 'hens' only.

High-spirited Mikey decided to make his outfit extra raunchy by donning a pair of Sylvia's knickers before joining Mario and Dennis in the soapy hot tub.

Over-excited Dennis squealed: 'Mikey, you've got somebody's thong in your hand.'

Sylvia's amusement at the soapy tub action quickly turned sour when she realised Mikey was wearing her intimates.

Laying down the law: Sylvia tells Mikey off as he offers to buy her some new knickers

Sylvia stormed: 'They're mine... That is so out of order. You don't go around putting on other people's knickers.'

Mikey said: 'I'll take them off,' but his attempts to appease bad-tempered Sylvia were in vain.

She raged: 'Mikey, I'm so f***** off right now. I don't even know what to say.'

Groom Mario defended Mikey and offered to buy her some new knickers.

He said: 'It's just having a laugh. It's the stag party.

'I don't think he stretched them.'

Sylvia continued: 'No it's not having a laugh! I can't believe you would be so disrespectful.'

Alexandra supported Sylvia, saying: 'I'm not finding any part of this funny at all. The disrespect in this house is going too far.'

Suds up: Dennis, Mario and Mikey - wearing Sylvia's knickers - cosy up in the hot tub

An apologetic Dennis later attempted to calm down Sylvia, who spent the remainder of the stag night criticising Mikey and Mario.

However, Sylvia was not backing down: 'I felt I was being made to look like a fool and that is what I'm so angry about. Do they know me? I don't have to take that shit from no-one.'

Mario reassured Mikey that Sylvia had over-reacted and her anger wasn't totally directed at him, claiming she had 'sour grapes' because Stephanie hadn't chosen her to be in the bride's party.

Earlier that evening, Stephanie chose Kathreya, Lisa, Rebecca and Rachel to be her bridesmaids and they had their own intimate 'hen night' in the bedroom.

Mario said: 'The problem is because they never got picked as bridesmaids they had faces like smacked a****. It was written all over them.'

Amusement: Before knickergate, 'stags' Sylvia, Dale, Jennifer and Luke are in hysterics watching Mario, Dennis and Mikey's bathtub action

The bride and groom: The happy 'couple' are reunited at the end of their hen and stag nights