Ashley Graham, Ronda Rousey and Hailey Clauson Grace the Covers of Sports Illustrated Swimsuit 2016

SI_Ashley_IG - H 2016

SI_Ashley_IG - H 2016

The groundbreaking issue features Graham as the magazine's first size-16 cover girl.

Talk about a triple threat! UFC fighter Ronda Rousey, fashion model Hailey Clauson and plus-size model and body activist Ashley Graham have been revealed as the highly anticipated covers of the 2016 Sports Illustrated Swimsuit edition.

Announced on Saturday during TNT's SI cover reveal special with Nick Cannon and Rebecca Romiijn, the new issue, which hits newsstands Monday, makes history by not only naming three cover girls for the issue, but also featuring Graham as its first size-16 cover model. The shot depicts Graham, who has appeared in the likes of Vogue and Harper's Bazaar, wearing a string bikini on the beach.

"The three covers of Hailey, Ronda and Ashley celebrate the new SI Swimsuit. All three women are beautiful, sexy and strong," says assistant managing editor MJ Day on the magazine's website. "Beauty is not cookie cutter. Beauty is not 'one size fits all.' Beauty is all around us and that became especially obvious to me while shooting and editing this year's issue."

Graham, who already made history last year as the first plus-sized model to land an ad in the annual swimsuit issue, was just as surprised by the announcement, and took to Instagram to share her awe and happiness.

"Truly speechless!! This cover is for every woman who felt like she wasn't beautiful enough because of her size," she wrote in a post accompanying her new cover. You can do and achieve anything you put your mind to."