"Welcome to the world, Blue," Beyonce and Jay-Z close friend Gwyneth Paltrow tweeted Sunday. "We love you always."
The actress also responded to a "confused" fan who asked if the baby's name is "Ivy Ivy Blue or Blue," saying, "This is Blue Ivy!"
According to GMA, the couple chose "Ivy" because of the importance of the number "4" or "IV," - Beyonce and Jay-Z was born on 4 September and December 4, respectively, were married on 4 April, 2008, and the latest Beyonce album titled 4 .)
This is the first child for the "Love on Top" singer and hip-hop mogul Jay-Z (real name: Shawn Carter), 42.
An observer at NYC's Lenox Hill Hospital told Us Weekly that Jay-Z was seen walking the hospital halls Saturday morning looking for "happy." Beyonce's family members - sister Solange, Tina and Mathew Knowles's parents - also seen at the facility with "flowers with pink balloons and ribbons of silver and black," added the witness.
Confirming the big news? None other than superstar pal Rihanna, who tweeted Saturday, "Welcome to the world of Carter's daughter! Love Aunt Rih."
Fellow hip-hop icon Russell Simmons also wrote: "Congratulations to my good friends Beyonce and Jay-Z."
30 years old singer first announced she and her hubby, 42, who expect at the MTV Video Music Awards in August. During an extraordinary "Love on Top" his performance, he exclaimed, "Feel the love that grew inside me," before tearing his sequined purple blazer to reveal her baby bump.
Beyonce was seen recently in NYC Thursday night, covering up her growing baby bump with a colorful scarf.
Although rumors spread earlier this month that she had given birth, sources told Us Beyonce Roc Nation and the maestro actually spent New Year's dinner on fried chicken and oysters in Brooklyn restaurant Buttermilk Channel.
