In the 1930s, she moved to Rio de Janeiro, where she married Luís Simões Lopes, chief of staff of President Getúlio Vargas. De Heeren lived at the Catete Palace, the seat of the president of Brazil, sparking controversy over her relationship with the president. De Heeren never confirmed nor denied the allegation.
Decades after Vargas's death in 1954, his secret diary was published with multiple references to his "bem-amada" (English: "beloved"). Some historians believe that the "bem-amada" was Aimée de Heeren.[3][4][5][6]
De Heeren was also seen with Coco Chanel (now known to be a Nazi agent) at many receptions, including the two Circus Bal events given by Elsie de Wolfe.[8][9] Chanel and de Heeren remained close friends, particularly towards the end of Chanel's life.[10]
According to US Vogue editor Bettina Ballard, de Heeren, at the time called Aimée Lopez or Aimée Lopez de Sotto Major, made a huge impression on French society:
I particularly remember the season when Aimée was lionized in Paris. She was so pretty, so genuinely nice, carried gaiety with her like a fan, and she was almost eaten alive. Hung with diamonds, she was pushed from fittings to balls, never allowed a moment for private conquest because every hostess needed her for her party to prove that she could draw the lioness of the season. Aimee just wanted to dance and flirt and have fun. That wasn't what Paris expected of her.
Due to the Nazi occupation of France, she was forced to emigrate to the USA, where she reunited with Joseph P. Kennedy Jr., the oldest of the Kennedy brothers, with whom she had fallen in love while in Europe.[12] Her friendship with the Kennedy family lasted until her death.
De Heeren was listed as one of the best dressed women in the world several times, and a 1941 edition of Time magazine included her as number three in a list of "Ten Best Dressed Women in the World".[14] She was mentioned in magazines such as Vogue.[15] She was included in the International Best Dressed Hall of Fame List in 1996.[16][17]