New pictures have emerged of the royal family (Including Frederik's mother Princess Margaret) attended a museum in celebration of their royal father's milestone Birthday.
The sweet snap which includes the siblings smiling alongside each other was shared on the official royal Instagram page.
"On the occasion of H.K.H. The Crown Prince's 50th birthday attended H.M. Queen and Crown Prince family today in the revelation of a new portrait of the Crown Prince at the National History Museum at Frederiksborg Castle," the snap was formally captioned.
"Subsequently, the Queen opened the exhibition 'H.K.H. Crown Prince Frederik - Prince to Denmark', which through draws and pictures tells about the Crown Prince with a downturn in events and themes that are central to the Crown Prince's life course.
"The exhibition provides a wide range of thematic insights into the Crown Prince's life through five decades. The new portrait of the Crown Prince is painted by Australian-born visual artist Ralph Heimans and shows in the background Havesalen at Fredensborg Castle," it concluded.
This is a rare look at Princess Mary, 45, and Prince Frederick's children.
The couple shares son Prince Christian, 12, and daughter, Princess Isabella, 10, and 7-year-old twins Prince Vincent and Princess Josephine.