View gallery Rob Kardashian turns 39 on March 17, 2026, and what better way to say, "Happy Birthday, Rob," than celebrating his major milestones through the years? Although Rob adopted a private lifestyle since his time regularly appearing on Keeping Up With The Kardashians, he's just as important to the show as his famous sisters, Kim, Kourtney, Khloe and Kendall and Kylie Jenner. The only son and brother in the Kardashian clan, has gone through a real maturation over the years. He started a sock business, became a father, overcame personal struggles with his weight and more.