Kourtney Kardashian -- Size Matters, So I Need A Bigger One

Kourtney Kardashian and Scott Disick need bigger digs -- because procreation is on their minds ... again.

Living is hell for them right now ... The family of 4 is currently crammed into a 5,100 square foot box in Calabasas. With only 4 bedrooms and 5 baths ... it's like Ethiopia with an Armenian twist.

So ... we found out Kourtney is headed for greener pastures. She checked out this home in Hidden Hills -- 7,500 square feet, 6 bedrooms, 8 baths and, just a stone's throw from her mom, Kris Jenner, who lives 2 miles away.

BTW, the price is sure reasonable -- $6.495 mil.