Celebrity Brooke Shields's Chiseled Abs Will Give You a Serious Dose of Fitspo By Brandi Fowler Brandi Fowler Instagram Website In addition to her extensive fashion, lifestyle, and beauty coverage for InStyle, Brandi has worked as a writer and editor for E! Online, a fashion and lifestyle writer for Hello! US, an editor/on-camera host for AOL, contributing writer and red carpet correspondent for Variety and Cosmopolitan, and has also served as the Hollywood correspondent for Australia's 9News' TheFIX. Her editorial features can also be found on Vitruvi, MTV News, Madame Noire, Hello Beautiful and more covering fashion, beauty, lifestyle, travel, and entertainment news. Her articles have been syndicated by the likes of Health, Marie Claire, Essence, Shape, Yahoo!, People, and more. InStyle's editorial guidelines Updated on March 24, 2017 @ 07:45PM Pin Share Tweet Email Photo: Sean Zanni/Patrick McMullan via Getty If you need a little inspiration to keep up the hard work in the gym (or step it up) before summer hits, take one look at Brooke Shields. As the 51(!)-year-old former supermodel hit the beach with her bestie, she spotlighted her chiseled physique on the shore in a photo she shared on Instagram Thursday, which showed her striking a pose with her hand on her hip in a bandeau blue bikini and straw sun hat. "The hard work is starting to pay off," Shields captioned it ... and it certainly is. In the snap, the actress's sculpted abs, arms, and legs are all visible as she looks out onto the beach as her brunette locks cascade over her bikini top. If this is the "start" of her fitness regimen paying off, we can't even imagine how her body will transform when she reaches her goal. Brooke Shields Is Proof That True Style Is Eternal WATCH: Over-50 Beach Babes Although Shields didn't reveal the fitness and diet secrets behind her toned bikini body just yet, one thing is for sure: she's only getting better with time.