R&B superstar Beyonce has given birth to a baby daughter.

The "Crazy in Lov"e singer delivered little Blue Ivy Carter in New York's Lenox Hill Hospital on Saturday night via a scheduled Caesarean section, according to Reports.

She's the first child for Beyonce and her rapper husband Jay-Z, who married in April 2008.

Beyonce's friend Gwyneth Paltrow was one of the first to Tweet about the new arrival, revealing the newborn's name.

"It's Blue Ivy Carter," she said to confused fans on Twitter shortly after posting, "Welcome to the world Blue! We love you already."

"Umbrella" hitmaker Rihanna was also among the first to celebrate the new arrival, taking to her Twitter.com to post, "Welcome to the world princess Carter! Love Aunty Rih."

Hip-hop mogul Russell Simmons also tweeted, "Congrats to my good friends Beyonce and Jay-Z."