It's been confirmed that the Duchess of Cambridge's had a boy.
Kate Middleton went into labour with her third child early this morning, and was taken to the private Lindo wing of St Mary's Hospital in London.
Kate's baby arrived at one minute past 11 this morning, and weighed in at 8 pounds and 7 ounces. Prince William was beside her for the birth.
They're both doing well, and the Royal family are said to be delighted.
Prince William and Kate are already parents to Prince George (4) and Princess Charlotte (2).