A new royal baby is on its way after Zara and Mike Tindall announced they are expecting a second child.

The Queen - known to Prince George and Princess Charlotte as Gan Gan - is "delighted" at the news of her sixth great-grandchild, as are the Duke and Duchess of Cambridge and Prince Harry.

Mike and Zara's second child will be the sixth great-grandchild for the Queen. Photo / Getty
Mike and Zara's second child will be the sixth great-grandchild for the Queen. Photo / Getty

Equestrian champion Zara - the monarch's granddaughter - and former England rugby player Tindall are said to be thrilled at the prospect of a brother or sister for their daughter Mia, who is nearly three.

LIttle Mia Tindall will have a younger brother or sister. Photo / Getty
LIttle Mia Tindall will have a younger brother or sister. Photo / Getty

The latest addition to the royal family will be a playmate for cute-as-a-button Mia Grace, who was born on January 17th 2011.

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Following the news Mike Tindall took to Twitter to thanks everyone for their messages.

He wrote: "Just a quick one to say thank you for the messages. We are very very happy about the little one on its way. 2017 is already starting well!!"