An Australian Monarchists spokesman said the league was delighted by the announcement and sent their "warm greetings and congratulations" to the royal couple.
They added that she is suffering from severe morning sickness, as she did with her previous pregnancies.
This is published unedited from the PTI feed.
There will soon be another Royal baby!
Kensington Palace confirmed on Monday that the royals, both 35, are expecting baby number three.
Kono urges China, Russia to up pressure on N. Korea
North Korea bought into that kind of agreement in the past, before hardliners in the U.S. The launch marks the second time in four days that North Korea has tested its missiles.
Paddy Power offered 8-to-1 odds on Alice.
William and Kate were married in April 2011. Last week the royals toured the garden of their Kensington Palace home to remember the princes' mother and celebrate her contributions to their family and to the monarchy.
More recently, during a royal tour of Poland, Kate joked about a third child when given a cuddly toy created to soothe tiny babies.
On a royal tour of Poland in July 2017, Kate joked about having a third - after being given a present designed for newborns.
Prince William and the Duchess of Cambridge with their two children, Charlotte and George, pose for their first Christmas card as a family.
After being gifted a toy suitable for a newborn baby during an event in the country, she turned to Will and joked: "We will just have to have more babies!".