Kris Jenner has praised Blac Chyna for helping her reclusive son Rob Kardashian turn his life around following two years in hiding. The 29-year-old sock designer's new relationship with the busty model may not have gone down well with his famous sisters but his mother believes it's been the making of him. The 60-year-old matriarch explained: ''He feels so much better about himself [since they started dating]. He is doing really, really well. He is trying to be healthy and get in shape and he is also working on a couple of projects.'' But, although she's thrilled with Rob's recent progress, the brunette beauty has admitted she doesn't know Blac, 27 - whose real name is Angela Renee White - that well. Speaking on Australia's 'The Kyle and Jackie O Show', she said: ''I don't know too much about their relationship. I haven't really seen her that much and I don't know her as well as everyone else. She seems like a really nice girl but I just haven't been around her.'' Rob - who has spent the best part of two years in hiding - first went public with his relationship with the former exotic dancer three months ago but things didn't get off to a good start as his sisters - including Kim Kardashian West - reportedly tried to steer him away from his new lady love. Blac has also been engaged in a long-running feud with Rob's younger half-sister Kylie Jenner as she's dating the model's ex-fiancé Tyga, with whom she has son King, three. However, it's believed Blac - who used to be good friends with the Kardashians - wants to bury the hatchet with Kylie...