the danish monarch was joined on the balcony by her sons , crown prince frederik , 46 , and prince joachim , 45 , who were with her again for a procession down copenhagen shopping street strøget to the københavns rådhus -lsb- city hall -rsb- for a slap-up lunch .
the two were by margrethe 's side once again in the evening when the danish royals welcomed royals .