It's a girl! Beyoncé gave birth to her first child in a New York City hospital via C-section Saturday night. Proud dad Shawn Carter, a.k.a. Jay-Z, was there as well. The couple named her Blue Ivy Carter—though it was first reported to be Ivy Blue Carter, forcing celebrities like Gwyneth Paltrow to correct others on Twitter. Congratulations are pouring in. Rihanna wrote: "Welcome to the world princess Carter! Love Aunty Rih." Russell Simmons tweeted: "Congrats to my good friends Beyonce and Jay-Z."