The pressure to slim down is one that many brides face before their weddings.
Had an amazing time with @davidsbridal Shooting their Spring 2016 campaign in London Town. I'm so proud to be working with a brand that chooses to be an industry leader by showcasing size diversity in their advertising campaigns and hope that these images can inspire and help woman to feel as beautiful in their dresses on their special day as I did while I was shooting it. Rather than expect women to diet and starve themselves to fit into a wedding dress, it’s so refreshing to work with a company that has turned the tables by saying "We celebrate you just as you are!" #healthnotsize #bodypositive #loveyourbody @modernmusesnyc
Watson is a size 14, which is the average customer size for David's Bridal, Glamour reported.
She features in some beautiful snaps that were captured in London, as the designer expands into the U.K.
"I'm so proud to be part of an ad campaign that helps all women celebrate such an exciting milestone in our lives and it's really been an honour to work with a brand that sees the beauty in women of all shapes and sizes," Watson told TODAY.
David's Bridal CCO Trevor Lunn told BuzzFeed that it was important for the company to reflect the diversity of its customers in its campaign.
“It wasn’t that this season was precisely the right time to feature a size 14 model — it’s something we should have been doing all along," he said.
It's not the first time that David's Bridal has used a curvy model in a campaign.
Last year, it featured size 14 model Candice Huffine, who was also photographed for the most recent Pirelli calendar.
But neither are just models. They're also body-image activists who have spoken out on the importance of self-acceptance.
"It's extremely important to accept and love your body, this is why it's so important to have body diversity in the fashion industry," Watson said in a Popsugar story from last year.
"The message should be that all different sizes and shapes are beautiful."
Here are more photos of Mercy Watson, from her Instagram:
Also on HuffPost