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Watch this 'Little Star'! Ivanka Trump's daughter is the best big sister

/ Source: TODAY

Theodore James Kushner is just 9 days old, and he's already getting the star treatment at home.

Actually, Ivanka Trump's newborn son is just one of the stars of a family video she shared on Instagram Monday.

Trump's 4-year-old daughter Arabella is seen cradling little Theodore in the clip and the big sis does her best to support her brother's head (with a hand from mom at one point), as she gazes down at him and sings "Twinkle, Twinkle, Little Star."

MORE: Ivanka Trump and Jared Kushner welcome a baby boy

Loving siblings and a lullaby? It's almost too sweet!

Trump and husband Jared Kushner welcomed Theodore to the family on Easter Sunday.

Since then, Trump has shared a number of adorable family moments, both with Arabella and with her other son, 2-year-old Joseph.

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