ROB Kardashian showed off his impressive weight loss as he made a rare appearance for Khloe’s 36th birthday over the weekend.

The reality star beamed as he posed next to his sisters, while fans were quick to compliment Rob on his new look.

Proud mom Kris posted a picture of Rob with Khloe, Kendall and Kylie with the caption "4 out of 6".

She then posted another snap of her son beside Kourtney, writing: "These two cuties".

Rob took to his own social media page to post some photos from Khloe's celebration.

In one picture he is seen chatting away to Scott Disick.

In another – captioned "Woo back baby" – Rob stands next to Tristan Thompson and another friend.

Commenting on the star's noticeable weight loss, one fan wrote: "Looking good Rob!"

Another said: "Awww Good to see Rob!! He looks happy and healthy ?"

A third added: "Looking like the old Robert again!"

Last year Khloe revealed Rob had been working out at Kim's house.

She told ET: "He goes to Kim's, he's worked out for, like, the past five days or so, and he's kicking a**, and I just want Rob to do what's best for him and what makes him happy.

"And if that makes him happy, then we will all support him."

Rob is in the middle of a nasty custody battle with his baby mama, Blac Chyna.

The spat escalated earlier this month when Blac – whose real name is Angela White – claimed racism was the reason her E! reality show Rob & Chyna, never got a second season.

The famous family's attorney hit back at her claim that she was treated like a "unicorn black reality star" on her show with Rob Kardashian.

In response, the Kardashian's lawyer – Marty Singer – said: "This is a two-year-old lawsuit in which Chyna has changed her defense more times than we can count.

"Sadly, unsurprising to anyone, she has stooped to a new low, changing her defense to try to leverage the emotions and pain of the moment, insulting the pain and suffering of real victims of racial injustice and systemic racism.

“We take these allegations very seriously and once again, there is no ‘Rob & Chyna’ show if there is no Rob & Chyna.”

Rob & Chyna premiered in September 2016 and ran for one season. It was renewed but later canceled by the network.

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