They may only be four, but recently adopted twins Esther and Stella are already taking after their new mom, Madonna, in one big way -- singing!

The 58-year-old pop icon shared an adorable video of the girls on Saturday, showing them enthusiastically singing "Twinkle, Twinkle, Little Star" while dressed in matching striped pajamas.

WATCH: Madonna Confirms She's Adopted Twins From Malawi

"A little night music," Madonna captioned the video, adding several star emojis.

The "Rebel Heart" singer announced the adoption of Esther and Stella from Malawi earlier this month. She has previously adopted from the landlocked East African country, bringing home David and Mercy, both 11, in 2006 and 2009.

NEWS: Madonna Reveals Names of Her Adopted Twin Daughters on Instagram

Madonna also has two children from previous relationships, 20-year-old daughter Lourdes, with Carlos Leon, and 16-year-old son Rocco, with ex-husband Guy Ritchie.

See more of the Material Girl's youngest children in the video below.