Rob Kardashian has enlisted his fiancée Blac Chyna to help him lose 23kg by 11 May. The sock designer has revealed he weighs just under 113kg, but has appointed his significant other as his personal trainer to help him achieve his weight loss goal by the time she turns 28. In a series of Snapchat videos posted by Blac, Rob, 29, is seen getting on the scales, which reads 112.6kg, and he says: "I weigh 113kg and I'm 1.85m.