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Kyra Sedgwick, 59, uses this 'cleavage pillow' to ward off chest wrinkles

If you're a side sleeper, this little satin sidekick can help keep you comfy (and smooth!) as you snooze.

You may have heard it before, but sleeping on your back can help prevent wrinkles on your face. Why? The friction between your head and your pillowcase can cause your skin to stretch and scrunch up while you rest. Sleeping face up also keeps your skin-care products on your skin and off your pillow. But have you also heard that sleeping on your side can cause wrinkles on your décolleté? You can blame gravity for that one, but Kyra Sedgwick has a little secret that helps her defy the laws of physics: a cleavage pillow.

This comfortable pillow straps on like a bra to prevent chest wrinkles and discomfort as you sleep.

$48 at Amazon

The actress shared with The Strategist that she sleeps on her side with Intimia's Breast Pillow every night. "The cleavage pillow is something I've put on every night for the past 15 years or so. It basically creates a separation for your boobs so when you wake up in the morning, you don't have big, deep creases between your boobs and your décolleté. It's the most important secret of all," she said.

Plenty of skin-care products recommend that you apply them to your face, neck and chest. But how often do we actually apply our serums, moisturizers and more below the chin? The skin on the neck and chest is delicate, and it's one of the first areas to show signs of aging. The Intimia Breast Pillow attaches to your body using soft, bra-like adjustable straps. It comes in one size only, but the brand says it should work for anyone who is a B cup or above. Simply put it on, then go to sleep in any position you'd like.

The brand says this satin pillow not only helps prevent chest wrinkles, but makes sleeping a bit more comfortable, especially for pregnant or nursing women as well as those with larger cup sizes or PMS, or women recovering from a surgery.

Kyra Sedgwick
One of Kyra Sedgwick's "most important" beauty secrets is all about preventing wrinkles, but it has nothing to do with your face.

You can get the Intimia Breast Pillow in gold or silver satin (with a little decorative bow on the front!). More than 1,000 Amazon shoppers give it a five-star rating.

"I have to share this because I am so happy and it's so random," admitted one fan. "I bought this pillow which has straps like a bra because I'm a side sleeper and have chest wrinkles from my boobs smooshing together. ... I was worried the straps would be uncomfortable but was surprised they weren't at all. I slept all night which I never do, I think because it's basically like having a stuffed animal pressed to your chest which is so comforting."

"I'm a big side sleeper and have C-cup size tatas, so I get those annoying chest wrinkles from sleeping with the girls squished together," said another shopper. "This thing has been a game-changer! I still forget to put it on some nights, but it's made a drastic change in the wrinkles I get and I hope that wearing it long term will help prevent permanent chest wrinklage."

Some customers said it took them a little time to get used to sleeping with it — understandable! "An honest review is that this product takes a little while getting used to but what a treasure if you sleep with pain or discomfort!" shared one. "This helped me with the problem of waking up with stabbing pain in the breastplate area. I really liked the satin fabric too. The pillow is hard enough to stay firm but still soft on the skin, and adjustable straps help keep [it] in place."

OK, you can laugh a little, but preventing wrinkles is a lot easier and cheaper than getting rid of them! Put this pillow on before you sleep, under or over your pajamas.

$48 at Amazon

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The reviews quoted above reflect the most recent versions at the time of publication.