Harry Joseph Brant, a founding member of the next-generation jet set and a new-look “It” boy, was found dead on Sunday January 18 2021 at age 24. The cause was an accidental drug overdose of prescription drugs, his family said. He had struggled with addiction for several years. The younger son of Peter M. Brant, an industrialist, publisher and art collector, and Stephanie Seymour, one of the original supermodels, Mr. Brant grew up around the glitterati of the style and art worlds. He was a familiar presence at fashion shows and international parties at a young age, attending the Met Gala at age 16. Vanity Fair called him a “Little Lord Fauntleroy” for his unapologetic willingness to enjoy his own good fortune and looks, and New York Magazine once referred to Mr. Brant and his older brother, Peter Brant II, as “NYC’s Most Beautiful Teenage Brothers”; their social omnipresence seemed to invite a certain kind of hyperbole. Mr. Brant was known for pushing the boundaries of gender stereotype in both cosmetics and clothing. He dabbled in journalism as a teenage columnist for his father’s Interview magazine, modeled for Balmain and Italian Vogue (among others), and, with his brother, founded a unisex makeup line with MAC, releasing collections in 2015 and 2016. Though he attended Bard College, he did not graduate. According to his parents, he had been planning to enter a new drug rehabilitation center this year. In addition to Peter, Harry is survived by a younger sister, as well as an older half brother from his mother’s previous marriage to the guitarist Tommy Andrews, and four half siblings from his father’s previous marriage to Sandra Brant. (Another half sibling from Mr. Brant’s earlier marriage died in 2019.)