Kylie Jenner reached out to her brother Rob Kardashian via social media on Monday, writing a heartwarming message alongside a close-up photograph of the 28-year-old. "My best friend, my heart, my brother," the 17-year-old model wrote on Instagram.
The snap looks to be at least three years old and was taken on a beach. In the background a woman, who appears to be Kourtney, is raising her hands in the air.
Rob has kept out of the spotlight of late. Last year his mum, Kardashian matriarch Kris Jenner, shared that her son was "struggling with some stuff".
Speaking on E! News in June she said: "He is struggling with some stuff but my job is to be there for him and love him as hard as I can."
The Keeping Up With The Kardashians stars constantly share their support for their brother. Khloé spoke about the sock entrepreneur earlier this month, explaining that he has "a kind of social anxiety".
Model Kylie Jenner reached out to her brother Rob on Instagram
"I just feel, especially over the last year, Rob has become very introverted and has a kind of social anxiety," she told celebrity website Wonderwall while hosting a party at Las Vegas' 1 OAK.
"He's definitely not at his happiest place that he once was, and I know he can get to that happy place and he will."
She also took to Instagram to encourage her brother on the road to happiness. "Never will I ever meet another man as great as you! I know this is the year where you will find your happiness again! I will be right by your side, holding your hand, every step of the way!!! I adore you my one and only brother!!" she wrote.
Rob recently surprised fans when he posted an image of British actress Rosamund Pike drenched in blood, in character as the evil anti-heroine of Gone Girl. "This is my sister Kim," wrote the troubled star next to the image.