Blac Chyna Shows Off Her AMAZING WEIGHT LOSS . . . Her Stomach Is FLAT . . . Just NINE DAYS AFTER Giving Birth!!! (PICS)

Blac Chyna gave birth to her second child DREAM just nine days ago via C-Section. But she's already UP AND AROUND.

Yesterday Chyna stepped out for the first time publicly since giving birth. She was walking slowly - but she's definitely up and around.

And check out how FLAT her stomach is in the video she posted on Snapchat: