Sarah Nicole Landry is celebrating the swimsuit.
In the post, the Guelph, Ont.-based content creator posed in a variety of different bathing suits for the holiday, which took place on July 5.
In some of the snaps, Landry proudly displayed her natural and unedited body — stretch marks, cellulite and all — to encourage fans to accept their bodies and focus on being present.
"Happy National Bikini day to 12-year-old me that only knew board shorts and T-shirts while swimming. Update for her: We are doing just great. I’m glad she wore what she needed to then. And I’m glad I’m wearing what I want to now, too," she captioned the post.
The mother-of-four also used the hashtag "National Bikini Day," and wrote that she's "ready and waiting" for National One Piece Day, National Shorts and T-Shirt Day as well as National Wear What Works Day.
Landry's empowering pics were well-received by fans and fellow influencers, who praised her vulnerability and inspiring message.
Canadian TV host and self-love advocate Tracy Moore said: "Love them all!" along with a fire emoji.
"Icon alert! Love this message!" commented a follower. "I think we all have to wear what makes us comfortable — no matter what it looks like!"
"Iconic and empowering! I needed this today. I’m wearing the damn two-piece [swimsuit] this summer because I'm not letting negativity or low self-esteem win," shared another.
Canadian influencer and content creator Sasha Exeter chimed in: "Yes, my kween!"
"I was a shorts and t-shirt girl, too. My first swim without them felt amazing!" a fan told Landry. "Thanks to you, I've learned to love myself and try to find confidence with my own natural body."