It didn’t take long for Alyssa Milano’s son, Milo to adjust to the role of big brother!

Just days after the Charmed actress gave birth to baby No. 2— a girl, named Elizabella—on Sept. 4, her little girl made her world debut on Instagram, with a heartwarming picture of her 3-year-old son meeting his baby sister for the first time.

//instagram.com/p/puZHRuvJGr/

Old Pals: Milo has been ready to meet his baby sister, so they can finally hang out for real!

“Milo meets his baby sister for the first time,” the 41-year-old actress captioned the adorable shot, below.

Alyssa is hardly the first star to introduce her daughter to the world using Instagram—check out 12 other celebs who have done the same thing!