Thought you'd seen all there is to see of the internet's viral Mannequin Challenge? Think again. On Thursday as Rob Kardashian and Blac Chyna welcomed their baby girl Dream Kardashian, they also carved out a minute to film their entry to the challenge . . . from the delivery room. The clip features a hospital gown-clad Blac Chyna, a ready-to-catch-that-baby Rob, and even a Kris Jenner cameo appearance. We're definitely going to have to call it: this clip has raised the bar.