The singer gave birth at New York’s Lenox Hill Hospital on Saturday.
The couple were married in April 2008, and the pregnancy was made public at the MTV VMAs in August.
As yet, the baby’s arrival has not been announced officially, but several friends of the couple, including Rihanna, have Tweeted their congratulations at the birth.
“Welcome to the world princess Carter! Love Aunty Rih,” she said.
So it seems that Beyonce has finally given birth, for real. The baby girl’s name is rumoured to be called Ivy Blue Carter. Reports claim Beyonce and Jay-Z’s daughter was born on Saturday at a New York hospital.
The singer Beyonce (30) reportedly gave birth by Caesarean, having rented out the fourth floor of Lenox Hill Hospital for $1.3million and checked in under the alias Ingrid Jackson.
A hospital staffer told New York Daily News Beyonce checked in on Friday night, and security guards were on patrol outside the hospital on Saturday night.
Hospital workers apparently taped up security camera lenses and were ordered to hand in their mobile phones, in an effort to stop photos leaking.