Kanye and Kim Kardashian West Pose with North and Saint on Day 21 of KarJenner Christmas Card

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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DAY 21- West Family

A post shared by Kim Kardashian West (@kimkardashian) on Dec 21, 2017 at 7:05am PST

DAY 19

A post shared by Kim Kardashian West (@kimkardashian) on Dec 19, 2017 at 10:44am PST

DAY 18

A post shared by Kim Kardashian West (@kimkardashian) on Dec 18, 2017 at 9:13am PST

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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.”

DAY 8

A post shared by Kim Kardashian West (@kimkardashian) on Dec 8, 2017 at 8:50am PST

My greatest dream realized! 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. 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!!! You have made this experience even more magical than I could have envisioned! I will never forget how wonderful you've been to me during this time! Thank you for making me so happy my love! Thank you to everyone for the love and positive vibes! I know we've been keeping this quiet but we wanted to enjoy this between our family and close friends as long as we could privately. To enjoy our first precious moments just us ?? Thank you all for understanding. I am so thankful, excited, nervous, eager, overjoyed and scared all in one! But it's the best bundle of feelings I've ever felt in my life! ??????

A post shared by Khloé (@khloekardashian) on Dec 20, 2017 at 2:41pm PST

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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