Rob Kardashian, the founder of the socks brand Arthur George, made a rare appearance on Instagram to mark his older sister Khloe Kardashian's 39th birthday. Known for his preference for privacy and staying out of the spotlight, Rob shared a heartfelt tribute on social media to celebrate this special occasion and honor his sister.

On June 27, Rob took to Instagram and posted a picture of himself with his sister, Khloe Kardashian, along with a heartfelt birthday message. He wrote, "Happy Birthday @khloekardashian. Wishing you everlasting good health and happiness, my beloved buttercup!"

Furthermore, Rob expressed his gratitude towards Khloe and shared a photo featuring her alongside his 6-year-old daughter, Dream Kardashian, whom he shares with his former partner, Blac Chyna. In his tribute to Khloe, he conveyed his deep affection by stating, "I love you so much and I'm incredibly grateful to have you in my life. Thank you for all that you do for Dream and me. I honestly can't imagine my life without you. Happy birthday."