Transcript for Prince William, Princess Kate expecting 3rd child

reporting. Now on a much lighter note let's talk about that breaking baby news. Princess Kate and prince William announcing they're expecting their third child, a new sibling for George and Charlotte and looking for someone British to cover it and we found ABC's Nick watt. Good morning to you. So offensive, Dan. Anyway, this I think was an unscheduled announcement. Kate was supposed to be at work today. She pulled out at the last minute and palace officials came up with an explanation and it is morning sickness. This morning, baby news from the royal family. Kensington palace revealing the duke and duchess of Cambridge will welcome their third child. The queen is said to be delighted with the news of a new great grandchild. The duchess is once again being treated for severe morning sickness at kensington palace canceling her planned engagement this morning at the hornsy children center. The condition hospitalized her during her first pregnancy and requires extra hydration, medication and nutrients. The new royal, baby sister or brother for princess Charlotte and prince George will now be fifth in line to the throne after grandfather, father, big brother and big sister pushing uncle prince Harry down one spot. Harry is apparently not upset by that. Out and about this morning, someone shouteds, hey, Harry, what did you think, he said great news, fantastic. Already talking names, I'm afraid. A book maker has Arthur, Alice, Victoria as the favorites. Baby due April, may, something like that. Arthur sounds like there's good history behind it. Absolutely. Congratulations to them. Thanks. Sorry for offending you. No, you're not. He usually offends everybody now and then. Gigger, a serious situation out

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