A bride-to-be was left horrified after she walked in on her future mother-in-law doing something absolutely "disgusting" with her wedding dress.

The woman took to Reddit to share her anger at the ridiculous and frankly disturbing way her partners' mum was acting in the lead up to the wedding.

She has been engaged to her fiance for a year and in that time she has had to deal with constant overbearing behaviour from her future in-law.

Some of the things she complained about included them having a destination wedding in Colombia because "no one speaks English", not being involved in the planning, how big her engagement ring and house is, and that the bride is getting "fat".

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But the tipping point came when the bride walked in on the woman trying to squeeze into her wedding dress, news.com.au reported.

"What do I find but Future MIL struggling to yank my dress over her head BUT WAS FREAKING STUCK. I blurted out "what the hell?!" and she immediately started stammering "Oh my God! OH MY GOD! OH GOD," she wrote.

In her effort to get the dress over her body she had managed to destroy the sheer material at the back of the dress, burst the side zipper and get a dirty foot print on the train.

Unfortunately, that wasn't even the most disturbing part of the story, as when she pulled the dress off her she discovered that she wasn't wearing any underwear. She said that both her and her future husband were very disturbed by the situation.

"I doubt she was trying to just try on the dress for funsies; there was also a bouquet of dried flowers on the bed that wasn't there before," she said.

"I think the b***h was actually trying to pretend she was the bride … which for so many reasons, is so wrong."

To top it off she hasn't apologised or offered to pay for any of the damages to the dress and instead gave her a lecture about how much she spent on the item.

Read the full horror story below.

Imagine walking in on your mum-in-law stuck inside your wedding dress. Photo / Reddit
Imagine walking in on your mum-in-law stuck inside your wedding dress. Photo / Reddit