A bride has copped major flak online after her "bum cleavage" gown was posted to a wedding shaming group on Facebook.

Users likened the woman's sleeveless dress to that of a "strip show", with some people branding it as too risque for the special occasion.

The dress has an open back that stops right above the bride's bum, which has offended some who say it exposes her "bottom cleavage", while others praised the woman for wearing it.

The photo, which shows the bride and groom kissing, was posted online with the caption, "Cut seems a little low?"

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One person asked if "Butt crack is the new cleavage?", while another said although the bride had a nice figure, the dress was inappropriate for a wedding.

People slammed the bride's inappropriate
People slammed the bride's inappropriate "bum cleavage". Photo / Supplied

"Great shape I'd love to have her shape but this is a wedding not a strip show. My daddy would refuse to walk me down the isle half naked," said another.

"I don't care how hot you are, showing the tip of your buttcrack is NEVER a good look!".

But others disagreed, saying if they had a figure like hers they would still show it off.

"If I was built like that I'd wear that dress and never take it off," someone commented:

The photo was posted to a wedding shaming group on Facebook with the caption:
The photo was posted to a wedding shaming group on Facebook with the caption: "Cut seems a little low?" Photo / Supplied
And many others weighed in on the debate. Photo / Supplied
And many others weighed in on the debate. Photo / Supplied

Agreeing, another person said: "Nothing wrong with a bride looking sexy as hell."

Some group members went as far as saying the original poster must be jealous if she felt the need to shame the dress in the group.