Looks like Saint West is taking nicely to being a big brother.

Kim Kardashian captured a rare and touching brother-sister Kodak moment between her two youngsters, Saint and her newborn daughter Chicago West, Saturday morning (March 31).

"He loves her so much," the reality star mom captioned the shot on Instagram of her 2-year-old son giving his infant sister a sweet kiss on the nose. To make the memory even more special: it's the first pic we've received of Chicago interacting with her older siblings.

The snap, which shows baby Chicago nestled on a pink blanket in her heather grey garment, has already garnered more than 3.5 million likes and over 18,000 comments from Kim's following on the social media app.

In the past, the 37-year-old Keeping Up With the Kardashians star has often been sparing with putting her 17-month-old daughter in front of the camera. Lately, however, Chicago has been shown to be a photogenic little princess.

Earlier this month, Kim eventually offered her followers a full-face (filter-free) view of her and Papa Kanye West's newest extension to their family after she posted a picture of the toddler sporting a pink onesie and white bib with the following caption, "Morning cutie."

The precious baby-album-worthy snap arrives just days after the tots' recent family trip to the San Diego Zoo this week.

On January 15, Kim and Kanye — who share a daughter, North, and a son, Saint, — welcomed their second daughter and third child, Chicago, via surrogate and made the news public the following day. She weighed 7lbs., 6 oz. and was born at 12:47 a.m.

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