Plus-size model Tess Holliday protested topless at a station in Canada to promote body diversity.

The size 22 American was among a group of women who stripped down to jeans, shoes and bras, and carried placards around Union Station in Toronto.

'Today something amazing happened and I got to share it with these amazing women,' the 31-year-old wrote on Instagram.

Statement: Size 22 model Tess Holliday, pictured left, went topless at Union Station in Toronto, Canada, to promote body diversity

Attention: The 31-year-old, pictured left with another protester, was joined by a group of women carrying placards through the station

Empowering: The plus-size model said the stunt, which took place last night, was an 'amazing' experience

'Yes for body diversity. Yes to walking through Union Station in just your bra and jeans. Yes to us embracing our bodies at all stages.'

The placards bore 'body-positive' messages urging women to be 'unapologetic' about their looks, 'break the stigma' and 'fight for body diversity'.

The stunt was organized by Penningtons, the brand with whom Holliday has a clothing line, who broadcast it live on Facebook last night.

Message: The placards bore 'body-positive' messages urging women to be 'unapologetic' about their looks, to 'break the stigma' and 'fight for body diversity'

Campaign: The stunt was organized by Penningtons, the brand with whom the mother-of-two has a clothing line, who broadcast it live online

Footage shows the women walking around the station cheering and trying to engage with passengers around the station.

She was inundated with messages of support on social media from people who commended the 'brave' and 'inspiring' protest.

The mother-of-two is a prominent voice in the body acceptance movement after she became the first plus-size-20 model to be signed to a big agency.

'Brave': Holliday, pictured left with eight-month-old son Bowie, was inundated with messages of support on social media

Pioneer: The mother-of-two is a prominent voice in the body acceptance movement after she became the first plus-size-20 model to be signed to a big agency

She started the '#effyourbeautystandards' campaign on social media a number of years ago and it is now approaching two million posts.

She gave birth to her second baby, Bowie, her first with her fiance Nick Holliday, in June.

Rylee, her son from a previous relationship, celebrated his 11th birthday last month.