This blond and buxom lady is the English-born Queen of the Danish king Christian VII (1766-1808), Caroline Mathilde (1751-1775). She was a both tragic, and scandalous figure, but somehow she didn't lose her popularity with the Danes. Her brother, "Mad King George" III (1760-1820), was worried when she, at the tender age of 15, sailed off to marry the Danish king who was reputed to be rather "weird", although in some respects a quite accompliced, young man. Presumably some rumors of the king's odd behavior had reached England before the wedding, but married they were, and they had two children, Frederick VI of Denmark (1768-1839) and Princess Louise Augusta (1771-1843) whom she doted on.
King Christian VII and his queen, Caroline Mathilde
Both of the royal children were officially "legit", although everybody knew that the princess, Louise Augusta, was in reality the daughter of the King's German physician, Johann Friedrich Struensse (1737-1772). The King had met him when he went on an extended tour of Europe in 1769. By then, it was obvious that the poor, young man on the royal throne of Denmark and Norway was suffering from something that to modern doctors looks like a kind of Schizophrenia. As a child he had received a most brutal handling of a cruel governor, which may have led to a very unfortunate development of his illness.
Johann Friedrich Struensee
Nobody knew how to handle a sick man who was also a king, except Struensee, who also took hand of Caroline Mathilde, so to speak. She, who was young and full-blooded, fell in love with the German charmer, and, on the evidence of portraits, it's obvious that he, and not the king, was the biological father of the Princess Louise Augusta.
The Princess Louise Augusta
Struensee rose to an almost absolute power over the King, and he practically ruled the country. He even had the Council of State abolished, and from then on he gained more and more power. In many ways he was a most gifted as well as a very charming man, but the Danes hated him for instituting a lot of reforms that were far ahead of time and which they didn't understand or saw as "un-Christian". However, as he didn't even bother to learn the language, he became a sitting pigeon to his many enemies at court.
"Bootee-Katherine" (c. 1745-1805)
While this happened the King got totally besotted with a prostitute, "Støvlet-Katrine" (: "Bootee-Katherine") who actually may have been of royal blood. Her father might very well have been her godfather, Prince George Ludwig of Brunswick-Bevern, who supported her as a child. As to her mother, then she was a boot-designer who may have been of African origin. Anyway, Bootee-Katherine and the King had fun, touring bars and brothels, until she was evicted and booted out of the country.
I doubt that this scandal was considered worse than what the Queen did: She rode out with her lover, but not using a "lady saddle" or dressed appropriately for a woman: She wore some kind of Jodhpur which was considered extremely immoral.
Caroline Mathilde with her daughter, her lover and her husband
Between March 1771 and January 1772 Struensee issued no less than 1069 cabinet orders, i.e. three or even more a day. One of his reforms was the abolishment of all censorship, which led to a flood of pamphlets against him, his rule and his behavior. Not quite grasping the political turmoil he gave rise to, he ended up being arrested by the King's stepmother, The Dowager Queen, Juliana Maria, who was the mother of the King's disabled half-brother, Prince Frederick. One of his friends and closest affiliates, Edward Brandt, (who at one point had given the King a beating!), as well as the Queen, Caroline Mathilde, were arrested.

Struensee and Edward Brandt were executed in a very inhuman manner - probably after extended torture - and the Queen, Caroline Mathilde, was sent into exile in Celle in Germany. Without ever seeing her beloved children again, she died a few years after at the tender age of 23. However, her daughter, Louise Augusta, married Frederick Christian II. Duke of Schleswig-Holstein-Sonderburg-Augustenburg, and their daughter, Caroline Amalie, became the queen of Denmark when she married King Christian VIII. To me, that's a quite strange development of the scandalous love story of a queen and a German doctor who gained power of a country whose language he didn't speak and who was executed in a most barbaric manner.
Queen Caroline Amalie, the granddaughter of Queen Caroline Mathilde and Struensee
https://historiskerejser.dk/caroline-mathilde/
https://kvindebiografiskleksikon.lex.dk/Caroline_Mathilde
https://graenseforeningen.dk/leksikon/louise-augusta-1771-1843-prinsesse-hertuginde-af-augustenborg
Wikipedia