Kate Middleton is pregnant!

An insider told Life & Style that the Duchess of Cambridge and her husband Prince William announced the exciting baby news to their family on Christmas. Prince Harry couldn't contain is excitement and was jumping up and down and cheering.

RELATED: See How Much Princess Charlotte Has Grown in the Royal Family's Christmas Card!

kate middleton family – getty

The 33-year-old is two months along and couldn't be happier! Though she and William, 33, weren't expecting to welcome another child just yet – their son George is two-years-old and their daughter Charlotte is seven-months-old – they've been vocal about wanting to grow their family.

"Kate and William have always wanted to have a large family," the insider said. "But they didn't think they would be expecting baby No. 3 quite so soon."

Congrats to the Royal family!

Click through the gallery to see Kate's maternity style from her second pregnancy.

For more on Kate Middleton, pick up the latest issue of Life & Style Weekly, on newsstands now!