The 37-year-old "Keeping Up with the Kardashians" star - who already has four-year-old daughter North and 23-month-old son Saint with her spouse - celebrating the impending arrival of her third child with a Tea for Three party staged in a "cherry blossom forest" at her Los Angeles home.
Kim made the accidental revelation on the The Ellen DeGeneres Show, while talking about how four-year-old North is coping with the fact that she'll have another sibling soon.
She said: "You know, it is really different".
Ellen responded by saying: "She's a toy tester-and you just told us it's a girl".
It's okay, Kim. We all knew anyway. An insider reveals that the surrogate carrying Kim and Kanye West's third child is insisting on giving birth in the San Diego area, against Kim's wishes.
Nope Ellen offered the use of her random baby name generator which suggested Lip Kit-West Pop West and West West
While she's not sure how son Saint West would react because he's little and doesn't get it yet, daughter North is pretty excited, she said.
"People brought toys and gifts, and [North] was opening them all up the next day", she said. I just want everyone to write a name on a little tile and we'll see if something sticks'. "We're freaking out. We have no name".
"She has a toy, a llama", Kim shared.
Commenting on her stomach, one fan asked: "Is it just me or can you see the baby bump!?". There was also West West, Pop West, and Star West.
Recently, the Kocktails with Khloé star showed the slightest hint of a bump in a new Good American promotional picture that she posted to Instagram.
Kim revealed that both she and 'Ye agreed that North is too young to join the beauty vlogging community, but they did let her record a mini tutorial that would stay on their phones, to "test it out".