December 21, 2017 10:50 AM

The Wests are still a family of four — for now!

On day 21 of the KarJenner family’s mysterious, piece-by-piece Christmas photo reveal, Kanye and Kim Kardashian West strike a serious pose while their two children Saint, 2, and North, 4½, seem adorably distracted by other aspects of the shoot’s set.

Family photos of the Wests will soon include one more member. North, Saint and their parents are preparing to welcome a baby girl, via surrogate, whose pregnancy Kim confirmed in September.

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RELATED GALLERY: See Every Single 2017 Kardashian/Jenner Christmas Card Countdown Photo

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The spouses’ third child on the way will no doubt have a unique moniker like her siblings — and one of those siblings has a huge hand in deciding what that will be.

“Kim and Kanye are letting North help with naming the baby,” a source told PEOPLE recently, adding that guests at the reality star’s baby shower “wrote down favorite names for the baby” as well.

The source said that Kim, 37, “isn’t going crazy” with shopping this time around, explaining, “You can tell that she is an experienced mom and knows the essentials that the baby will need.”

RELATED VIDEO: Kim Kardashian West Is Giving Us a Piece of Their Christmas Photo One Day at a Time

The newest photo in the series comes the morning after Kim’s sister Khloé Kardashian confirmed her pregnancy with boyfriend Tristan Thompson, putting to rest any speculation that she may have been holding out to share her happy news on one of the last days of the holiday card reveal.

“My greatest dream realized,” Khloé, 33, wrote on Instagram alongside a bump picture. “We are having a baby! I had been waiting and wondering but God had a plan all along. He knew what He was doing. I simply had to trust in Him and be patient.”

She continued, “I still at times can’t believe that our love created life! Tristan, thank you for loving me the way that you do! Thank you for treating me like a Queen! Thank you for making me feel beautiful at all stages! Tristan, most of all, Thank you for making me a MOMMY!!!”

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