Town & Country will publish in its September issue a list of today’s 50 modern swans — borrowing the avian term created by Truman Capote for his inner circle, which included Babe Paley, Slim Keith, Lee Radziwill, C.Z. Guest, Gloria Guinness and Marella Agnelli.

But these days, the mag reports, “To be successful, most of these It girls can no longer afford to just sit still and look pretty. They travel from one Insta-worthy event to the next, they publish books, they design clothing lines for Nordstrom or they star in reality television shows.”

Making the grade are Keith Richards’ granddaughter Ella Richards, Sylvester Stallone’s spawn Sistine Stallone, Caroline Vreeland, Lily Mortimer, Gray Sorrenti and Eve Jobs.

In the political category, Donald Trump’s daughter Tiffany Trump fails to make the list, although his spokeswoman Hope Hicks, 27, does, and is dubbed “one of the unlikeliest breakout stars of the 2016 campaign.”

Sasha and Malia Obama also make the list, along with Alessandra Balazs, Colby Jordan and Princess Noor of Iran.