Not sure if this subject has been posted before, but I've just read that the Duke and Duchess of Cambridge are expecting twins?
"UK gossip magazine OK! claims Kate Middleton and Prince William are expecting twins, just eight months after the Duchess of Cambridge gave birth to Prince George.
"She and William had been trying since January. Will's told the queen he'd love to have at least two daughters. With all the boys in his family, he's trying to even up the balance," a source who claims to be close to the royal couple told the magazine.
The publication further claims that Kate, who gave birth to George on 22 July, is in a rush to have her second child."
I always thought having twins was more common than is the case, there were 8 or 9 sets of twins in just my year at school, most of which from my village, four of which (two sets) being very close friends. I think there must have been something in the water! :)