Royal baby No. 2 is on its way! On Monday, Clarence House confirmed the Duke and Duchess of Cambridge are expecting their second child. Photo: WPA Pool/Getty Images LONDON—Prince William, the second in line to the U.K. throne, and his wife, the Duchess of Cambridge, announced on Monday that they are expecting their second child, triggering a flurry of good wishes and speculation about the gender and name of the royal baby.