Beyoncé and Jay-Z welcomed baby daughter Blue Ivy Carter into the world Saturday night. The birth took place in New York, via a scheduled C-section.

The couple’s famous celeb friends took to Twitter to congratulate the duo.

Music mogul Russell Simmons wrote: “congrats to my good friends Beyonce and Jay-Z.” Rihanna wrote, “Welcome to the world princess Carter! Love Aunty Rih.”

Congratulations to the happy family!