ROB Kardashian is brother to Kim, Khloe and Kourtney Kardashian and is step-brother to Kylie and Kendall Jenner.

But, what else do we know about the reality star, his split from Black Chyna and his weight loss? Let's get the lowdown.

Who is Rob Kardashian?

Rob was born in Los Angeles on 17 March 1987 - that makes him 30.

He's a reality star and businessman with his very own sock line called Arthur George.

Rob is best known for appearing on Keeping Up With The Kardashians and its spin-offs, and for his 2011 appearance the thirteenth season of ABC's Dancing with the Stars.

Rob has previously dated singer Rita Ora and raises a daughter, Dream Renée Kardashian, with former fiancee Blac Chyna.

When did Rob split from Blac Chyna?

Rob and Blac Chyna started dating in January 2016. They got engaged in April 2016, announcing the good news on Instagram.

In September 2016, the pair confirmed they were expecting their first child together, and on 10 November 2016, daughter Dream Renée Kardashian was born.

Shortly after Dream's birth on 17 December 2016, Rob and Blac announced their split on social media after Chyna's Instagram account was hacked.

Rob told his social media followers that Chyna left him, moved out of their home and took their month old daughter with her. However, the couple reconciled as the split was revealed to be done in the "heat of the moment."

But on 5 July, 2017, Kardashian made a series of since=deleted Instagram posts accusing Chyna of infidelity and posting explicit pictures of her.

What has Rob said about weight loss?

Rob has piled on the pounds over the past few years, but has managed to shed some of his excess weight.

He has previously claimed to have lost weight through diet and exercise, and regularly updated fans on his progress through Instagram posts of his scales and of himself running on a treadmill.

Rob previously spoke about his weight, with US website E! reporting that Blac was "motivating him" to reach his goals.

However, Blac has claimed Rob underwent £75k of secret weight loss surgery - and then told the world that it was HER who had the lipo.

Blac, who filed her lawsuit under her real name Angela White, made the allegations while defending herself against similar claims made by Rob.

He previously used an Instagram post to allege that she underwent $100k (£75,000) of surgery after she gave birth to their baby daughter Dream.

She claims in the publicly available court documents: "In fact, Rob Kardashian himself underwent weight loss surgery that cost $100,000, whereas Ms White's surgery was for a lesser amount.

"Ms White underwent minor cosmetic procedures including a breast and butt reduction as well as a small amount of liposuction around her belly button.

"Ms White is a well known social media influencer and trendsetter who professionally endorses health, lifestyle, and diet products in her Instagram and Twitter accounts.

"Accordingly, the manner in which Rob Kardashian revealed Ms White's personal medical information jeopardised Ms White's endorsement deals with several weight loss, fitness and diet companies - that all pay Ms White to promote their products on social media."

She also claims that Rob said he'd claim the money for the surgery back from the production company that made their show, Chyna & Rob.