Chris Pratt and Anna Faris' son is too cute for words!

On the evening of Tuesday, Nov. 17, Chris, 36, took to Instagram to share an old video of his now three-year-old son, Jack — who was born nine weeks premature — to commemorate World Prematurity Day.

In the adorable clip, Jack can be seen coloring — while wearing a green bucket on his little head! — while listening to his parents sing "Ding-Dong! The Witch Is Dead!" from The Wizard of Oz.

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"Today is World Prematurity Day. Premature birth is the leading cause of death in children under 5 worldwide. About 15 million babies are born too soon every year. Nearly 1 million of these babies die within the first month of life. Support #WorldPrematurityDay and join the millions of volunteers who support #MarchofDimes," Chris captioned the video of his baby boy.

Anna, 38, and Chris — who married in July 2009 — welcomed Jack, their only child, in August 2012.