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The Duke and Duchess of Cambridge are adding to their family.  Prince William and his wife, Kate Middleton, are going to have a second child, according to a brief statement released by Buckingham Palace.  There's no word yet on when the baby is due. 

The Duchess of Cambridge is reportedly experiencing acute morning sickness and is receiving treatment at Kensington Palace.  Her treatment forced the cancellation of an official visit Monday, and palace officials say her schedule will be adjusted as her condition warrants.  

The announcement by Buckingham Palace said that the Queen and the rest of both families were delighted by the news.  British Prime Minister David Cameron also tweeted out his congratulations to the royal couple. 

The couple's first child, Prince George, celebrated his first birthday in July.  William is second in line to the British throne, while his son George is third in line.

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