'Back Baby'! Rob Kardashian Shows Off Weight Loss at Khloé's Birthday Party

Over the weekend, Rob posted photos from sister Khloé's 36th birthday party. In one pic with Khloé's ex, Tristan Thompson, and Savas Oguz, he wrote, “Woo back baby.”

Rob also shared pics with older sis Kourtney and her ex, Scott Disick.

Rob was joined at the party by young sisters Kendall and Kylie, who rocked pink hair.

Ahead of the birthday bash, Rob posted a throwback photo of him with Khloé, writing on Instagram, “Happy BirthdayKhlo-moneyyyy!! Woohoo ! 🤪 I LOVE YOU best friend 🥰💙💙 TONIGHT WE DRINK AS KINGS‼️ (inside joke)😭😭.”

Earlier this year, a source claimed that Kardashian was “considering going away to a live-in facility where he can be 100 percent focused on losing weight.” They told E! News, “His family has encouraged him and he feels like it might be just what he needs. He really wants 2020 to be his best year and to finally get healthy."

“His biggest motivator is Dream and he wants to do it for her," the source went on. "He needs an extra push and this could be the way to do it. At home, there are distractions and it's easy to fall off course with his eating and working out. He feels like at a live-in facility, he could get the big jump start that he needs."

The notoriously reclusive Kardashian rarely shares photos of himself to his 1.5 million Instagram photos, choosing to put the spotlight on his daughter Dream.

In October, Kardashian did show off his slimmed-down look for Halloween. Rob posed with mom Kris Jenner in the snap, with Rob dressed in a "Trolls"-inspired costume.