Monaco's Princess Caroline is reportedly pregnant again - at the age of 49. The new baby will be the princess' second with her third husband, Prince Ernst of Hanover. Caroline, the daughter of film icon Grace Kelly, already has four kids, aged from six to 21. Last year the princess' step-sons cashed in on their royal status by selling more than £8million worth of regal heirlooms. Prince Ernst and Prince Christian, from her marriage to Germany's Prince Ernst of Hanover, raised money from the items to maintain two stately homes they own. Ernst, 21 and his 19-year-old brother are the son's of Prince Ernst, who was previously married to their mother before he wed Monaco's glamorous Princess Caroline seven years ago. Caroline and Ernst, who have one daughter, Alexandra, wed in 1999, although Caroline's mother had made plans for her daughter marrying the handsome German royal before her early death.