|Date of birth||Stockholm, Stockholm Municipality, Stockholm County, Sweden|
|Date of death||Jan 07, 1839 Constantinople|
Gustava Charlotta Jacquette Aurora Gyldenstolpe (4 July 1797 – 7 January 1839, Constantinople) was a Swedish noble and lady-in-waiting. She is known as the mistress of Oscar I of Sweden in circa 1819-1827.
Jaquette was the daughter of Major General Nils Wexionius, 5th Count Gyldenstolpe (born 31 October 1768 in Forsby, died 28 August 1844 in Stockholm), and his spouse (married 12 April 1796 in Stockholm Castle), the salonist Charlotta Aurora De Geer (born 19 September 1779, died 14 May 1834 in Stockholm).
Jaquette Gyldenstolpe was a maid of honor to the queen, Hedwig Elizabeth Charlotte of Holstein-Gottorp. On 18 September 1817, she married Lieutenant General Count Carl Gustaf Löwenhielm (1790-1858) and moved with him to his estate in Värmland. The marriage was childless. Jaquette did not like the role of mistress at a country estate, and missed life at court. They moved back to the city when her spouse was appointed chamberlain to the Crown Prince. At the royal court, Jaquette became a center of the circle around the Crown Prince, alongside her mother, Gustaf Lagebjelke, Mariana Koskull and the wife of the Dutch ambassador, which amused themselves with masquerades and French language amateur theater at Rosersberg Palace. Jaquette and Oscar was pointed out as lovers in many private letters of the time. They behaved intimately with each other and it was noted that Jaquette did not use his title when she spoke to him. Her spouse tried to have her removed from court, but was prevented by her mother.
In 1822, Crown Prince Oscar was sent on his trip to Europe to find a bride. Jaquettes spouse Carl Gustaf Löwenhielm was a part of the entourage, and while he worked for Josephine of Leuchtenberg to be selected among the candidates, Jaquettes mother worked for a Princess of Hesse-Cassel. When Josephine was chosen, Carl Gustaf Löwenhielm was entrusted with the arrangements and made many trips to Bavaria in 1822-23: afterward, he was made Swedish envoy to Constantinople in 1824-1827. During his absence, Jaquette remained in Sweden. Jaquette bore a daughter by the name of Oscara, who has been pointed out as the daughter of Oscar. The baby was given up to burgher-class foster-parents, and was given their last name. In 1827, Jaquettes spouse Carl Gustaf Löwenhielm returned to Sweden and interrogated her with out success about the rumors and about the luxurious decoration of her apartment. He then filed for a divorce.
Jaquette divorced Löwenhielm on 1 September 1829 on the grounds of different characters. Her second marriage to the Finnish Baron Uno von Troil (1803-1839) took place on 21 August 1838. Both spouses died within a year of the marriage in Turkey, where Baron von Troil held a diplomatic post. This marriage too was childless.