BIGGEST LOSER

The skinny on Rob Kardashian’s recent weight loss

The prodigal son returns! After five years out of the spotlight and a nasty split from baby mama Blac Chyna, Rob Kardashian came out of hiding for sister Khloé’s 36th birthday in June. “[I’m] back, baby,” the 33-year-old wrote, posing happily with his famous family. And his mom, Kris Jenner, 64, couldn’t be more proud. “She was posting photos, showing off his weight loss,” says a source. “Mostly because she can’t wait to get him back on the show!” New York–based Dr. Niket Sonpal, who hasn’t treated the reality star, estimates he’s lost about 50 pounds. Lookin’ good, Rob!