The Kardashian sisters are a force to be reckoned with. But one guy has the ability to stop the Keeping Up With the Kardashians crew in its tracks: Kourtney Kardashian's unborn baby boy! Kourt, 30, and boyfriend Scott Disick, 26, just announced they're expecting a son in December. Life & Style spoke with Kourtney, Kim, 29, Khloé, 25, and their mom, Kris Jenner, 53, about all things baby at the grand opening of Famous Cupcakes in LA on Oct. 7. "Khloé and I are planning a baby shower for the end of November," Kim tells Life & Style. "I'm so excited to see Kourtney take on this new role. We will always be there if she needs us."

Who's most excited about the baby's arrival?

Kris: Pick me, pick me.
Kourtney: My mom.
Kim: Mom is going to be the most emotional, since this is her first grandchild. Everyone in the family just can't wait for the baby to come. I am so excited to be an aunt.
Khloé: Now that Kourtney's almost due, it's exciting. Before it was like, "Hurry up." Now it's like, "Oh my God, the baby is coming!"

For more on Kourtney K's baby, pick up the latest issue of Life & Style, on newsstands now!

Photo Credit: Startraks