<p>Singer Beyonce Knowles has given birth to a baby daughter.<br /><br /></p>.<p>According to contactmusic.com, the 30-year-old delivered the girl, named Ivy Blue Carter, in Lenox Hill hospital here Saturday night via a scheduled Caesarean section.<br /><br />She's the first child of Beyonce and rapper husband Jay Z, who got married in April 2008.<br /><br />Rihanna was among the first to congratulate through micro-blogging site Twitter: <br />"Welcome to the world princess Carter! Love Aunty Rih."<br /><br />Hip-hop mogul Russell Simmons also tweeted, "Congrats to my good friends Beyonce and Jay Z."</p>
<p>Singer Beyonce Knowles has given birth to a baby daughter.<br /><br /></p>.<p>According to contactmusic.com, the 30-year-old delivered the girl, named Ivy Blue Carter, in Lenox Hill hospital here Saturday night via a scheduled Caesarean section.<br /><br />She's the first child of Beyonce and rapper husband Jay Z, who got married in April 2008.<br /><br />Rihanna was among the first to congratulate through micro-blogging site Twitter: <br />"Welcome to the world princess Carter! Love Aunty Rih."<br /><br />Hip-hop mogul Russell Simmons also tweeted, "Congrats to my good friends Beyonce and Jay Z."</p>