King Frederik and Queen Mary have jetted off for a secret holiday with their children, leaving Queen Margrethe as head of State. The King and Queen of Denmark are travelling abroad during their children’s Easter holidays for some rest. The Danish royals have four children: Crown Prince Christian, 18, Princess Isabella, 16 and twins Prince Vincent and Princess Josephine, 13. A Palace spokesperson told the Danish publication HerΝ that Queen Margrethe, 83, will act as head of state in the Danish monarch’s absence. Queen Margrethe, who recently abdicated the throne, will be spending the Easter hol…