It's an unwritten rule of weddings - don't wear white.

However, a mum has sparked some serious backlash after she showed up to her son's wedding in a full-blown bridal gown.  Yes, really. Photos of the mother of the groom's outfit were shared on the Facebook group, That's It, I'm Wedding Shaming. One of the pictures showed her posing alongside the bridesmaids, wearing a strapless white fishtail gown - and, honestly, she could have easily been mistaken for the bride. Especially since the two of them had very similar-style dresses on. The caption said [via The Sun]:

“You guys, this is my husband’s aunt at her son’s wedding. Lady, TF are you doing?!”

The photos understandably sparked a lot of outrage among Facebook users, with many people branding the mother of the groom an "attention seeker." "She wore the same silhouette as the bride too. Mess. She could literally have worn anything else," someone fumed. "I'd have 'accidentally' spilt my wine on her and mashed are into her dress. Sorry sis. You're rainbow now," Another person added. "I honest might consider not kicking her out if this happened to me just because of the sheer bravery of this bold, bold move," A different person admitted. It's not the first time that someone had broken the 'no-wearing-white-to-a-wedding' rule. A few months ago, a bride told of her fury after her mother-in-law went behind her back to choose a white dress for her wedding day. The bride-to-be said that she took her partner's mum out to buy an outfit for the occasion but that the older woman later picked out a dress on her own. The mother-of-the-groom's chosen dress turned out to be a floor-length white gown with a pink and grey floral pattern. The bride confronted her mother-in-law, who told her that she didn't want to conform to the colour scheme as "light pink, blush, peach colours like that wash me out" - and the bride wanted to know if she was being unreasonable in her reaction.