Chrissy Teigen and John Legend's baby daughter is getting cuter and cuter with every photo!

The model shared a sweet new snapshot of little Luna on Monday, Sept. 5 — and we can't get over how fast the famous couple's little girl is growing!

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Chrissy simply captioned the Instagram pic of the four-month-old sitting up with a baby emoji.

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The 30-year-old and her singer hubby, 37 — who married in September 2013 — welcomed Luna, their only child, in April 2016.

Click through the gallery below to see more of Luna’s cutest photos!