Khloe Kardashian has been an open book about her futile effort to-date to get pregnant, and on Sunday's Kourtney and Kim Take Miami, her sister Kourtney said she'd be a "spare womb," and act as a surrogate.

Khloé, 28, dropped details about her infertility with hubby Lamar Odom, saying their journey to conceive has "been awkward."

"About a year ago we just said let's just let it happen -- but when it didn’t happen, Kim was like, 'Lets go to the doctor,'" she recalled. "I found out I don’t ovulate and my uterus lining isn’t thick enough, and I have to take pills to make my uterus lining thicker, and if