Kourtney Kardashian is about to pop!

The heavily pregnant mommy-to-be treated son Mason to a playdate with friends on Saturday afternoon, and it looks like he'll be expecting a baby sister any day now.

Kardashain looked maternity chic in a flowing maternity dress, hot pink jacket and oversized Celine tote, while little Mason kept it casual in jeans and a Van Halen t-shirt.

Although she's nine months preg, Kourt is still working hard at the sister's boutique Dash in LA, and the 33-year-old recently shared: “This week I stopped by our brand new DASH LA store to check on the progress and show Ken Baker at E! News how the store was coming along. Our designer Jeff Andrews has done an incredible job and we are all so excited to see the store when it is all completed."