Rob Kardashians finacee, Blac Chyna is having a cheat day. Taking a break from her home-cooked meals, Chyna stopped by a local McDonald?s in Los Angeles on Friday to grab a quick meal. According to Chyna, she plans to train her beau for the next five weeks and help Kardashian, who currently weighs 248 lbs and has been struggling with his weight, to shape up before her birthday celebrations in May.