Rob Kardashian, 33, looks amazing! The Arthur George founder shocked off his dramatic weight loss at big sis Khloe Kardashian‘s lavish 36th birthday party, which was at her home on Saturday, June 27. Rob was back to his old self as he grinned from ear-to-ear in the sweet candid shot with Khloe, and little sisters Kendall Jenner, 24, and Kylie Jenner, 22. “4 out of 6 #happybirthdaykhloe,” mom Kris Jenner, 64, captioned the cute June 28 post.