A woman has exposed her sister's "horrible" method of selecting her six bridesmaids.

Anyone who’s ever planned a wedding, or been anywhere near someone who is planning a wedding, knows that sometimes, things can get a little crazy in the process.

I’m talking arguing with your mum about the flavour of your wedding cake crazy.

Or yelling at your bridesmaids the night before your wedding because they are painting their toenails instead of helping you do something, you can’t remember what, but it was obviously very important at the time, okay?

But one woman’s story of the stunt her younger sister is pulling ahead of her big day definitely takes the (chocolate mud) cake.

A 33-year-old woman has turned to Reddit for help after revealing her 22-year-old sister was ‘auctioning off’ spots in her bridal party.

"She got engaged a couple of months ago and will be getting married at the end of August...she still hasn't chosen her bridesmaids," the woman, who referred to herself as 'sistersbridesmaids', wrote.

"Instead, she has sent out dozens of... invitations, to various girls. It's an invite to attend and participate in a 'bidding auction' on the six spots in her bridal party.

"Whichever six of all these chicks bid the most will be the bridesmaids. There's also an auction for being her maid of honour."

Her sister will use the money she makes from the auction to pay for her wedding and honeymoon, even though her sister's fiancé is from a wealthy family.

Naturally, people were a little... confused by the bride's "awkward and tacky" method of choosing the women who will help her the most on her big day.

"Why would anyone do this? I can't wrap my brain around it," one person wrote.

"The nutters are those willing to actually pay to be in her wedding party."

"Of all the things I could voluntarily spend my extra money on, this would be at the very very very bottom of the list," another said.

LISTEN: Today in bridesmaids gone wrong...this woman was excluded from her friend's wedding because of her weight.

The sister has so far refused to RSVP to the bride's auction, a move that has not gone down well with the rest of her family.

"Now my sister is throwing a tantrum... and got our mum on her side too," she wrote.

"Mum says I will 'look bad if I don't put in a bid when it's my own sister' and called me selfish."

She asked other Reddit users whether she should indeed make a bid, or take a stand against her sister.

Unsurprisingly, many said she should stay as far away from the drama as possible.

"This can only get worse," one reader wrote.

"This is horrible. She will always be horrible."

Some suggested bidding a small amount - like $1 - or a donation to charity in an attempt to show off her disapproval.

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"Donate to charity in her name, and use that donation as your bid. If she refuses, she looks like a prat, and you can feign insult," someone offered.

"Don't go," said another.

"But if you do go, get a video. I definitely wanna see how something like this goes down."