Glenn Close knows frown lines are nothing to smile about.

The actress, 79, caught up with Page Six Style at the NYC premiere of “All’s Fair” Season 2 this week, telling us she’s a fan of an old-school anti-aging hack: Frownies Facial Patches.

Billed as “the original wrinkle patch,” the non-invasive stickers come in two sizes — one for the forehead and one for the corners of the eyes and mouth. Both are meant to be worn overnight to help smooth fine lines.

“It’s been around forever,” Close told us. “Gloria Swanson wears a Frownie in ‘Sunset Boulevard.’ It’s a little piece of paper … to keep you from frowning when you’re sleeping.”

“It works,” she added, quipping, “Of course, you frown when you wake up — but at least you don’t frown when you’re sleeping!”

A week before the red carpet, Close wore one of the patches on her forehead in an Instagram video. (“I have my Frownie on because I am working at my desk, and I frown — and Frownies help,” she told viewers.)

Close’s hack has a long history in Tinseltown, as the product was first invented back in 1899. According to the Frownies website, the founder’s daughters traveled the country in the ’30s to share the stickers with “Broadway performers, makeup artists and Hollywood stars.”

It seems they were successful; late starlet Dixie Dunbar wore them in a photo in Life magazine in 1937, while Raquel Welch wrote about Frownies in her 2010 memoir “Beyond the Cleavage.”

The Kardashian-Jenners have also been linked to the smoothing stickers, as Kris Jenner reportedly said in 2011 — long before the launch of Skims’ sculpting face wraps — that Kim, Kourtney and Khloé “all used the patches.”

Perhaps Kim and Glenn can share on set.

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This article was written by Hannah Southwick, Commerce Associate Editor for Page Six. Hannah spies deals on actually affordable celebrity-worn styles, puts celebrities’ brands to the test and finds the beauty products that keep stars red carpet-ready. She consults stylists and industry pros — including celebs themselves — for firsthand product recommendations, trend predictions and more. In addition to writing for Page Six since 2020, her work has been featured in USA Today and Parade.