Iconic emcee Jay-Z and Pop princess Beyonce are now parents, giving birth to a baby girl named Ivy Blue Carter in New York City on Saturday. The couple welcomed the 3rd member of their celebrity family at Manhattan "s Lennox Hill Hospital.

TMZ.com reports that the baby was believed to be a Cesarean section delivery.

Proud dad Jay-Z, real name Shawn Carter, was at the hospital where Beyonce reportedly birthed Ivy by c-section -- and shortly after her arrival ... J & B "s famous friends started sending out birth announcements on the Internet.

Rihanna tweeted, "Welcome to the world princess Carter! Love Aunty Rih"

Hip-hop mogul Russell Simmons also took to Twitter, saying ... "congrats to my good friends Beyonce and Jay-Z."

Beyonce famously announced her pregnancy on stage at the MTV Video Music Awards back in August.