Celebrity Bindi Irwin Calls Brother Robert 'My World' (PHOTO) The 16-year-old shared a sweet selfie with younger brother Robert on Instagram By Anya Leon Anya Leon Anya Leon is a Senior News Editor and the Parents Editor for PEOPLE. She's been at the brand for over 14 years in various roles across the Entertainment, Lifestyle and News teams. She has appeared on PEOPLE's podcast, PEOPLE Every Day, and covers everything from exclusive pregnancy news to every single Kardashian birth (11 and counting!). She resides in Northern Virginia with her family. People Editorial Guidelines Published on January 4, 2015 02:35 PM Share Tweet Pin Email Photo: Courtesy Bindi Irwin Wildlife isn’t the only thing that has captured Bindi Irwin‘s heart. The daughter of the late Steve Irwin played the role of proud big sister when she snapped a sweet selfie with her younger brother, 11-year-old Robert, on Saturday. “This boy is my world,” Bindi, 16, captioned the shot of the siblings smiling for the camera, adding a heart emoji at the end. It’s been a good year for Bindi – who also showed off her new darker do in the photo – as she celebrated her 16th birthday with a trip to get her learner’s permit. But the actress told PEOPLE in July that the transition since the Crocodile Hunter‘s death in 2006 continues to be difficult. “That kind of sadness never goes away. It’s like losing a piece of your heart that you never get back,” she said.