Daughter of ‘80s fitness guru stuns in 2 string bikinis for 'SI' Swim

Abby Tegnelia

Daughter of ‘80s fitness guru stuns in 2 string bikinis for 'SI' Swim image

Amy Sussman/Getty Images

Like mother, like daughter.

For swimsuit model Katie Austin’s 32nd birthday, SI Swim shared two of the most stunning string bikini pics from her whopping five appearances in the iconic Sports Illustrated swimsuit issue.

There were so many to choose from ‚ the second-generation fitness entrepreneur lives a bikini body-worthy lifestyle and has the chiseled physique to prove it. The results? A whopping five appearances in the iconic glossy.

In one photo, the flawless model and nutrition guru — it’s literally in her genes; Mom is workout legend Denise Austin — rocks a tan-color bikini with a rose at the center of the top. In the second, she wears a fluorescent green two-piece with a sporty top and tiny bottoms.

“Wishing the happiest of birthdays to Katie Austin!!” the brand captioned the October 2 share to X (formerly Twitter). “The remarkable five-time SI Swimsuit model has shown she’s a force to be reckoned with every single time she returns to the fold.”

Denise, 68, is an active fitness instructor and coach who was an icon in the ‘80s and ‘90s, pioneering at-home video tape workouts and other entrepreneurial endeavors.

Katie’s 2025 appearance in the magazine was photographed in tropical Bermuda. An October 2 article in Sports Illustrated Swimsuit included a montage of her steamiest looks from all five years she’s modeled for the magazine.

MORE KATIE: ‘SI’ Swim model flaunts flawless physique in bra top, sheer skirt at ESPYs

She also worked the catwalk in the Sports Illustrated Runway Show to close out Miami Swim Week this past May 31. The VIP-only event starred the issue’s cover stars Livvy Dunne, Jordan Chiles and Lauren Chan, plus other models from the issue such as Xandra Poh, Jena Sims, Penny Lane and Ellie Thumann.


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Abby Tegnelia

Abby is a freelance writer with The Sporting News. She has been a prolific lifestyle and celebrity news writer and editor for more than 15 years. She has served as News Director at In Touch, reporter/writer at Us Weekly, reporter at New York magazine, and has written for national and international titles including Marie Claire, Glamour, Huffington Post and Expedia.