President Reuven Rivlin tweeted his blessings to Prince William and the Duchess of Cambridge on Monday after the birth of their third child, a son. "Mazel tov! Congratulations to TRH the Duke and Duchess of Cambridge on the birth of their son #RoyalBaby. Together with Nechama, and all the Israeli people, I send warmest wishes to Her Majesty the Queen & all the Royal Family. Looking forward to welcoming the Duke to Israel soon."