Little Prince Christian had his highest profile royal role to date as he helped Queen Margrethe unveil a special portrait to commemorate her 40 years on the throne.
A pull of a golden chord revealed the painting, which depicts the royal matriarch, resplendent in a fuchsia pink gown – along with her son Prince Frederik and her beloved grandson.
Both will one day be king.
Christian looked thrilled to be taking part in the opening of a special exhibition, titled Regent for 40 Years - Queen Margrethe 1972-2012.
The cute six-year-old – dapper in a grey trousers and jacket ensemble - has shot up recently, and looks more and more like his father with each passing month.
His mum, Crown Princess Mary looked on proudly as her son helped out the opening at the museum of national history.
Margarethe ascended to the throne on January 14, 1972, after the death of her father, King Frederik IX.
She said this week that she had no plans of retiring anytime soon, as she views the job as being "for life".
"In my eyes, in a hereditary monarchy, this position means that when an old king dies, the new regent is created.
"I feel it's a responsibility that you receive. And you must stay there for all your life."