water again, kate?

09.12.127:03 PM ET

Here's To Our New Family! Kate and William Drink ANOTHER Toast - With Water

William earlier told a schoolkid he wanted to have two children
Britain's Prince William and his wife Catherine, the Duchess of Cambridge, make a toast in the honour of Queen Elisabeth Diamond Jubilee at a British Gala reception at the Eden Hall in Singapore on September 12, 2012. Britain's Prince William and his wife Catherine arrived in Singapore on September 11 to kick off a nine-day Southeast Asian and Pacific tour marking Queen Elizabeth II's Diamond Jubilee. AFP PHOTO/ POOL /Nicolas ASFOURI        (Photo credit should read NICOLAS ASFOURI/AFP/GettyImages)
Nicolas Asfouri, AFP / Getty Images

It's not uncommon for husbands to give up drinking alcohol in sympathy with their wives when a couple are expecting a child, and, if Kate really is pregnant, it seems the royal couple may be doing just that.

For, tonight, Kate and William drank a traditional champagne toast to the Queen with goblets filled with water, fuelling speculation that a royal pregnancy is upon us.

Of course, it could just be the tropical heat - but it is unheard of to drink a royal toast with water except for medical reasons.

Last night, Kate also made the royal toast with water while William opted for a glass of red, but tonight, at a banquet at Singapore's Eden Hall, they both drank water, grinning broadly at each other as they did so.

Earlier in the day, during a walkabout, William told a child who asked him a direct question that he would like to have two children.

A source told the Royalist that Kate was pregnant during the Olympics, but that the couple have decided to wait 'as long as possible' before announcing the news.

They will certainly want to wait at least three months, meaning an announcement could be several weeks away.