Her father held several jobs as a social worker, real estate agent, and financial investor, while her mother, Sandi Herbert, worked with developmentally disabled adults.

[2] Harlow contracted Lyme disease and black mould poisoning whilst living at a home in Big Sur in 2013, and experienced C-PTSD as a result of the illnesses.

[19][20] In May 2023, she was featured on the cover of Vogue dedicated to Karl Lagerfeld shot at the Grand Palais alongside Adut Akech, Amber Valletta, Anok Yai, Devon Aoki, Gigi Hadid, Kendall Jenner, Liu Wen, Naomi Campbell and Natalia Vodianova.

Harlow has also walked runways for Chanel, Dior, Prada, John Galliano, Fendi, Givenchy, Hermès, Yves Saint Laurent, Gucci, Alexander McQueen, Michael Kors and many more.

She has appeared in advertising campaigns for Dolce & Gabbana, Max Mara, Ralph Lauren, Chloé, Giorgio Armani, Valentino, Lancôme, Saks Fifth Avenue, Gap and others.