Derek Charles Blasberg (born April 22, 1982) is an American writer, socialite, and fashion industry personality.

[8] He cultivated a friendship with Nicky Balestrieri, another student who had worked as a fashion model, and lived in the same dormitory, NYU's Hayden Hall.

In April 2010, Blasberg's debut book, Classy: Exceptional Advice for the Extremely Modern Lady, was published.

[16] By February 2015, Blasberg was known as "one of fashion blogging's biggest names" although that ended when Condé Nast abruptly sold the website and advertising platform which he and others had used since 2010.

He interviewed Reese Witherspoon, Gigi Hadid, Naomi Campbell, Maria Sharapova, Rosie Huntington-Whiteley, and other celebrity models and actresses.

[23][24] By 2006, Blasberg's presence on the guest list for many celebrity events attracted the attention of The New York Times, who profiled him as part of a possibly new phenomenon, "the male socialite.

[6] He had his own Opening Ceremony stationery line, the "Handwritten Letter Helper," and provided etiquette tips for correspondence.

[32] Blasberg is friends with many celebrities, models, media personalities, and movie stars; Jeff Bezos, Kris Jenner, and Anne Hathaway helped him celebrate his 42nd birthday with a party at his Upper East side home (which he had written an article about for Architectural Digest several years earlier[33]) in May 2024.