Baby Prince William, Baby Kate Middleton

Tim Graham/Getty Images, The Middleton Family

Prince William and Kate Middleton have welcomed their third child together!

The Duchess of Cambridge gave birth to a baby boy Monday. The couple's third child, whose name has yet to be announced, joins siblings Prince George and Princess Charlotte in the royal family.

Now that the baby has arrived, we're celebrating by looking back at William and Kate's childhood pictures! The cute pictures show the adorable duo in their younger years, spending time with family and smiling for the camera.

Take a look at the super sweet baby pics of William and Kate below!

Prince William, Baby, 1983

Tim Graham/Getty Images

Princess Diana, Prince William, 1983

Jayne Fincher/Princess Diana Archive/Getty Images

Kate Middleton

The Middleton Family

Prince William, Diana Princess of Wales, Prince Charles

David Levenson/Getty Images

Prince William, Toddler

Anwar Hussein/Getty Images

Kate Middleton

The Middleton Family

Prince William, Child

Tim Graham/Getty Images

Kate Middleton

The Middleton Family

Prince William, Prince Harry, Children

Tim Graham/Getty Images

Prince William, Skiing

Tim Graham/Getty Images

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