"We welcome you to share in our joy. Thank you for respecting our privacy during this beautiful time in our lives," said a handwritten message posted on the site and signed by the Carter family.
Rapper Jay-Z was born Shawn Carter. He and Beyonce married in 2008.
Daughter Blue Ivy, their first child, was born in New York Jan. 7.
Aaron Carter is still in love with Hilary Duff
Ray Liotta sues skin care company over use of likeness