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Rob Kardashian's 50lb weight loss

Rob Kardashian's 50lb weight loss

Rob Kardashian has lost 50lbs.

The sock designer currently weighs 248.4lbs, down from his heaviest weight of 298lbs, but wants to lose another 50lbs before his fiancée Blac Chyna's birthday in May.

He wrote on Instagram: "Looking from where I started 298lbs to my current weight now 248.4lbs. I'm focused and determined to reach my goal weight 200-205lbs .... Happy I found my motivation."

And it is believed his motivation is his fiancée, who he recently proposed to after a whirlwind romance.

Last week Blac, 27, revealed she was planning to get Rob in shape by her 28th birthday on May 11.

Rob, 29, has battled for his weight for some time and contracted diabetes, and his sister Khloe Kardashian revealed last month he has been working on his fitness.

The 31-year-old beauty said: "He's working on his fitness journey right now and so, I'm just really happy that he's living this mantra that I preach every day."

Rob's family are said to be less than thrilled about his engagement, and are reportedly unconvinced it will last as he previously professed his undying love for exes Rita Ora and Adrienne Bailon.