Gwyneth Paltrow has cleared up confusion over Beyonce's new baby girl's name, confirming the tot is called Blue Ivy Carter.

The Crazy in Love singer delivered a daughter at New York's Lenox Hill Hospital on Saturday night (07Jan12) via a scheduled Caesarean section.

Early reports suggested the R&B superstar and husband Jay-Z had named their firstborn Ivy Blue Carter, but family friend Gwyneth Paltrow has clarified the gossip.

In a post on her Twitter.com page, she writes, "Welcome to the world Blue! We love you already", later telling a follower on the site, "It's Blue Ivy Carter!"

Beyonce's sister Solange Knowles has also taken to the microblogging site to gush about her new niece, declaring her to be "the most beautiful girl in the world."

Actor/singer Tyrese Gibson wrote, "Congrats to you both... You are loved...! Beyonce and Jay are new proud parents of a healthy baby girl... Blessings!!"