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Fall has officially begun — at least according to Kourtney Kardashian's hair. The reality star and Lemme founder kicked off what she calls "witchy season" in a moody mirror selfie on Instagram on Sept. 20, debuting a fresh set of one of this year's most popular hair trends: " Birkin" bangs . The cut feels effortlessly cool and a little mysterious, giving her look an instant edge that feels perfect for this time of year.

Named after '60s style icon Jane Birkin, the fringe is defined by its slightly uneven, piecey texture and flattering, eyebrow-grazing length. "Getting bangs, especially Birkin bangs, is a great way to instantly change up your look," hairstylist Devin Toth of Salon SCK tells PS. "They shorten t

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