She’s best known as the girlfriend of Twilight stud Kellan Lutz. Sharni Vinson proved she also has some muscle power as she flaunted her six-pack in a ruffled bikini on Cronulla Beach in Sydney Tuesday. The Australian 29-year-old put her slim yet toned frame on display while on a sunny stroll along the picturesque coastline. The Step-Up 3D star kept her brunette locks hidden under a white trucker cap emblazoned with a barcode. What a delightful way to spend the day at the beach. She’s making her way through the Hollywood ranks so keep your eyes open for much more of her.