Beyoncé and Jay-Z  are the proud parents of a baby girl. The couple welcomed a daughter on Saturday night in New York, according to multiple sources.

The baby was born via scheduled C-section. There are varying reports on what they named her. E! News claims that Jay-Z is telling friends that his newborn’s name is Blue Ivy Carter, while TMZ is reporting it as Ivy Blue Carter.

Their pal Rihanna was among the first to congratulate the new parents. “Welcome to the world princess Carter! Love Aunty Rih,” she tweeted.

Music mogul Russell Simmons also chimed in with his well wishes.

“congrats to my good friends Beyonce and Jay-Z.”

Beyoncé first announced her pregnancy in late August at the MTV Video Music Awards. Following the baby’s birth, the majority of trending topics on Twitter were dedicated to the Carters’ bundle of joy.

In a previous interview on “20/20,” Beyoncé shared her excitement about becoming a mother.

“The best thing is knowing that my favorite person in the world I haven’t met them yet, and hopefully I’m gonna pass on things that generations of my family have passed on to me,” she told Katie Couric.