Celebrity Kourtney Kardashian Works It Out With Kim and Khloé in This Instagram Snap By Rita Kokshanian Rita Kokshanian Rita Kokshanian is a Los Angeles-based writer and editor who covers celebrity, fashion, beauty, and lifestyle. She was previously an Assistant Editor for InStyle and is currently the Senior Copywriter at The Grind. InStyle's editorial guidelines Updated on July 8, 2015 @ 11:30AM Pin Share Tweet Email Photo: Kevin Mazur/Getty Images Sisters who work out together, stay together. On Tuesday, Kourtney Kardashian broke her social media silence following the news that she and Scott Disick were reportedly splitting after 9 years together when she 'grammed a photo of herself and her two sisters Kim Kardashian and Khloé Kardashian exercising. "Sister workout sesh this morning in the rain," the eldest Kardashian captioned the shot (below), which shows the three reality stars working it out on Bosu balls. The workout snap was just the first of three photos Kardashian shared of herself and her sisters on social media Tuesday. Later on, she posted two separate shots of the sisters wearing all white and posing for the cameras. Kourtney Kardashian Shares a New Photo of Baby Reign