Celebrity Kelly Rohrbach Admits Baywatch Co-Star Zac Efron's Abs Were Hard to Miss By Jonathan Borge Jonathan Borge Instagram Twitter Jonathan Borge is a writer and editor living in New York City. His writing has appeared in Glamour, Refinery29, Forbes, and PAPER, among other publications. Plus, he's held staff positions at Marie Claire, InStyle, and OprahDaily.com. Currently, he's the Senior Entertainment Editor at Bustle Digital Group's Elite Daily, where he oversees digital covers, features and profiles, freelance essays, and strategy for the site's TV/Movies and Celebrity and Music sub-verticals.He primarily writes about pop culture and style, and has a passion for telling LGBTQ+ and Latinx stories. When he's not working, he's likely waiting for Lady Gaga to announce her next tour. InStyle's editorial guidelines Updated on May 30, 2017 @ 05:00PM Pin Share Tweet Email That iconic red one-piece swimsuit may be the star of Baywatch, but you won’t be able to miss 27-year-old actress Kelly Rohrbach. So what was it like to slip into that look? “When I first put the swimsuit on it was in a fitting and it was just a couple of pins and scraps of material. So it wasn’t until the first day of shooting in my trailer that I had that ‘aha! Oh my gosh, this is happening!’ moment. And by then, I was so nervous that it was my first day on set that I can’t even remember that moment of putting on the suit,” she tells InStyle in the video above. Barely there outfits aside, Rohrbach proved to be a badass off camera, too, meeting with the writers and directors to tweak her character’s original lines. “Originally my character was written a little bit more standoffish to Jon Bass’s character Ronnie Greenbaum. When I met John, I instantly fell in love. He’s such a sweet person and such a great actor and so funny. So I thought how could anybody be cold to this guy? I sat down with the director and the writers and was like, let’s make it more interesting for the audience.” Mission accomplished. Additionally, Rohrbach opens up about getting into tip-top beach-ready shape, and yes, all things Zac Efron. “Zac’s physical transformation was unlike anything I’ve ever seen. He was so ripped. He had muscles that I didn’t know we have,” she says. He worked really hard and was super disciplined. We’d all be like sneaking peanut M&M’s off craft services and he was like, ‘Guys, no! I can’t.’ So kudos to him ‘cause he made it happen.” RELATED PHOTOS: Every Time Zac Efron Made Us Question Monogamy Watch our full interview with the star above.