Rob Kardashian
Rob Kardashian, photographed at the Planet Hollywood Resort and Casino in Las Vegas on June 3, 2012 for the Miss USA pageant, made his first appearance on social media in several weeks Thursday. Getty Images

Millions of people in the United States rushed to stores Wednesday in hopes of potentially purchasing the winning Powerball lottery ticket. Among those hoping to make off with the $1.6 billion prize — the highest in the history of Powerball jackpots — was former "Keeping Up With the Kardashians" star Rob Kardashian.

Wednesday night's Powerball drawing resulted in three grand prize winners, but based on Rob's latest Instagram post, he most likely wasn't one of them. As was reported by Us Weekly, the Arthur George sock line creator took to Instagram Thursday to post about the momentous occasion. Rob, 28, shared a meme depicting the Michael Jordan crying face on the body of a man holding a gun. The text posted above it joked about all the Powerball losers returning to the store for refunds on their tickets.

While it remains unclear why Rob is rarely seen on social media (his latest post was his first since November 2015) it could be because he's focusing on his health. On Jan. 7, it was reported that Khloé Kardashian was working hard to get her out-of-shape brother, who put on more than 100 pounds in recent years after two consecutive ugly breakups, on board with her fitness regime. In a post on her website she told fans that working out has been a great way for her to keep her mental health in check, adding that showing off her revenge body to her exes is an added bonus. She said she uses this same ideology to inspire Rob to work out, though it is unclear whether or not he's participating. Given his recent health scares, however, it seems as though it would be in his best interest to give it a try.

Rob was hospitalized in last month after falling ill over the Christmas weekend. Doctors ran several tests, concluding that the ex "KUWTK" star had been unknowingly living with diabetes. He was released from the hospital shortly after being admitted, but has been urged to make his health a priority or risk suffering from more severe symptoms from the disease. Sources told E! the hospitalization was a "wake-up call" for Rob who plans to loose weight and change up his unhealthy diet.