Telling the story is exactly where Kardashian slipped up and revealed the big news. "People brought toys and gifts [to the baby shower] and we were opening them all up the next day and North said: 'Mom, since baby sister's not here, I think I need all of her toys in my room and I'll play with them and just make sure they're OK for baby sister.'"
Degeneres was quick to point out that the gender was big news, which caused Kardashian to laugh and re-confirm that yes, she was having a baby girl via surrogate.
"North is really excited about that. [Her having] a brother was a little trickier. Now, she's so excited. Let's see if it lasts," she added. "I've had to explain to her: 'When you come into my room in the morning I have to be with baby sister, I have to feed her.'"
The star also admitted to not having picked out a name for the little girl yet, even after having baby shower attendees write their favorite names on tiles to see if any of them stuck. She mentioned that North was particularly fond of the name Star, but Kardashian joked, "I’m not vibing with it.”
Back in September, Kardashian confirmed that she and husband Kanye West were expecting a third child during a teaser for Keeping Up With The Kardashians. Watch Kardashian's accidental gender reveal below.