Who would have thought a day of baby shopping could be so emotional?

Kim Kardashian hit Bel-Bambini boutique last week in West Hollywood with her pregnant sister Kourtney, only to battle a host of feelings – starting with frustration at not knowing what sex her sister's baby will be.

"I found that really hard," Kim wrote on her blog. "I just wanted to shop for pink or blue, haha! I want Kourt and Scott to find out already!!"

But that was nothing compared to the sudden stirring of Kim's maternal instincts.

"I want a baby!!!!" she writes. "OK, so maybe not right now, but I can't wait to be an aunt!"