It looks like Kate Middleton and Prince William are on their way to going from a foursome to a party of five. Kensington Palace has officially announced that the royal couple is expecting their third child.

"The Queen and members of both families are delighted with the news," a press release from Kensington Palace said.

While everyone's excited about the baby news, Kate is unfortunately experiencing the rough early days of pregnancy. She's apparently going through Hyperemesis Gravidarum, which is a severe form of morning sickness. So Kate had to cancel her events for today (September 4).

Will and Kate already have two kids -- Prince George, who's four, and two-year-old Princess Charlotte.

Prince Harry is also looking forward to being an uncle again. Watch his response to the British press below.

Congratulations to the Royal Family!

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