Beyoncé Knowles has given birth to her first child, a daughter named Blue Ivy Carter.
The baby was born via scheduled caesarean section at Lenox Hill Hospital in New York City on Saturday night.
Beyoncé's husband Jay-Z — real name Shawn Carter — was at her side during the birth and mother and baby are reportedly doing well.
The couple's close friend Gwyneth Paltrow confirmed the baby's name on Twitter, posting: "Welcome to the world Blue! We love you already".
Gwyneth later clarified the baby's full name, after a confused Twitter followed enquired about it. "It's Blue Ivy Carter," she wrote.
The baby's middle name is thought to be in reference to Beyoncé and Jay-Z's love of the number four.
They both have the Roman numeral for four, IV, tattooed on their wedding fingers.
Beyoncé's birthday is on September 4, while Jay-Z's is on December 4. Beyoncé's latest album is called 4, and it's her fourth studio album.
The 'Blue' could be in reference to Jay-Z's Blueprint trilogy of albums.
Beyoncé, 30, and Jay-Z, 42, married in April, 2008.
Your say: Do you think Blue Ivy is a good baby name?
Video: Beyoncé's baby joy
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