Prince George To Become a Big Brother

Duchess Kate and Prince William are expecting their second child.
1:32 | 09/08/14

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Transcript for Prince George To Become a Big Brother
And by George, that bombshell from the royal family tonight. Another royal baby on the way. This was Kate Middleton four weeks ago, one of her last public appearances. The world didn't know then that she was pregnant. And tonight, she is suffering from acute morning sickness, leaving her husband, prince William, to face the crowds and the questions alone today. ABC's boboo wdruff at kensington palace for us tonight. Reporter: The palace surprised nearly everyone today, going public that the duchess of Cambridge is nearly 12 weeks pregnant. It's great news. Early days, but I'm hoping she feels better. Reporter: William attended an event in oxford today, alone. Kate stayed home, once again being treated for the same severe kind of morning sickness that hospitalized her during her first pregnancy. If there's any silver lining here, it's that they know what's going on, they know a little bit about how to deal with it. But it's certainly doesn't make it any easier. It's been a year of royal baby mania. Prince George has charmed the public from that first wave to his royal tour down under. And his first official public play date. George will be thrilled having another smaller, younger, brother or sister. Yeah, we'll wait and see. Reporter: The duchess of Cambridge is now back in their London home here. The kensington palace. She's being cared for by the same doctor here who delivered their first child, prince George. And prince William says he will spend his time tonight by her side.

This transcript has been automatically generated and may not be 100% accurate.

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