She's really expanding her family at lightning speed!

Kourtney Kardashian is expecting her third child with boyfriend Scott Disick, and what better way to tell your baby daddy than while the cameras roll for your reality show?!

That's exactly what the eldest K sister did on the preview for the new season of Keeping Up with the Kardashians, and The Lord seemed genuinely caught off guard by the announcement.

"I'm pregnant," she reveals while Scott responds, "What?! Holy s**t!"

The clip also teases Khloe's split from Lamar Odom, Kim K's wedding prep, Kendall venturing out on her own and taking the fashion world by storm, and much more.

We can't help but watch!