Designer Rebecca Minkoff helped define the downtown New York “it” girl aesthetic of the early aughts. Now she’s making reality TV her runway. The 42-year-old fashion designer has a recurring role on the new season of “The Real Housewives of New York City,” which premiered Oct.

1 on Bravo. She appears as a close friend of the cast, which includes fashion designer and businesswoman Jenna Lyons, 56; brash real estate agent/developer Erin Lichy, 37; moody model-turned-hot sauce entrepreneur Ubah Hassan, 41; no-nonsense influencer Sai De Silva, 43; comms girl-about-town Brynn Whitfield, 37; unfiltered fashion publicist Jessel Taank, 44; and art curator Racquel Chevremont, 53. It’s the 15th season for the show and the second since a dramatic, controversial reboot saw beloved, longtime cast members, including Ramona Singer, Sonja Morgan and Dorinda Medley, kicked to Andy Cohen’s curb.

“It’s fun, funny with a little bit of a drama – I said, ‘Okay, I can sign up for that,’” Minkoff told The Post of joining the show after a mutual friend connected her with Lichy, who talked up the gig. Minkoff launched her eponymous line of boho clothes and oversized hobo bags in 2005 with her brother Uri Minkoff as CEO. It quickly took off, and stars such as Lindsay Lohan and Jessica Alba were regularly photographed with her iconic Morning After Bag — a $525 tote that carried many stylish 20- and 30-something women into adulthood.

In recent years, Minkoff has had a resurgen.