The most eccentric beauty secrets from Salma Hayek, Kendall Jenner, and more Hollywood stars

When Reese Witherspoon is looking to lose weight quickly, she eats 14 jars of baby food, according to Shape and Self. The Baby Food Diet became really popular among celebrities a few seasons ago, and it's only supposed to be maintained for two weeks.

Salma Hayek revealed—in a New York Times interview—that she washes her face at night and avoids doing so in the morning. According to her grandmother, your face doesn't “get dirty” during the night, and it's best to preserve the skin's natural protection.

The 50-year-old actress also avoids using sunscreen, when unnecessary, to avoid coming into contact with chemicals.

Who would've thought that you could find the best moisturizer for your hair in the kitchen? Yes, you got it right, we're talking about mayonnaise. A product the actress, Blake Lively confessed to using in an interview with Byrdie; it's used on the tips just before going into the shower, just like her mother recommended. The result? Moisturized, shiny hair.

The top model Kendall Jenner swears to drinking 12 cups of detox tea every day, in addition to following the paleo diet, which is based on the consumption of meat, fish, fruit, vegetables, and greens according to E! News. This secret to maintaining a sculpted body involves avoiding foods like rice, pasta, legumes, and nuts—in addition to any processed foods.

This star's secret is one of the most ostentatious, and it's one of the key ingredients in her regimen for keeping her face's skin young and firm. According to Elle, Angelina Jolie uses natural caviar to maintain her eternally youthful skin.

We all envy Jennifer Aniston's straight blond hair. How do you make it look perfect? The actress—one of the most popular in Hollywood—confessed in an interview with Women's Health that she stops washing it for two or three days—sometimes even longer—and the result is frizz-free hair.

In addition to good nutrition and exercise, there are celebrities such as Kim Kardashian who have aces up their sleeves when it comes to achieving a wasp silhouette with a tiny waist, and in her case it's the use of a corset. The leader of the Kardashian-Jenner clan revealed on social media that she managed to shrink her waist down by 7 centimeters after wearing this corset for at least four hours a day. The actress Salma Hayek shares this essential trick to keeping an hourglass figure.

According to Bazaar, Jenny from the Block gets placenta facial treatments, which are ideal for increasing the production of collagen vital for looking young and radiant. And she's not alone: Eva Longoria is also a fan of placenta facials.

The youngest of the Kardashian-Jenner clan, Kylie , also reveals her beauty secrets on social media. Everyone wants to have full lips like hers. The celebrity's lip challenge went viral when everyone started to use a shot glass or plastic cup to plump up their lips to look like Kylie Jenner's.

But long before demonstrating this quick fix, Kylie Jenner explained what she actually does to have fuller lips, in addition to lip fillers: she applies a dark lip liner, a lipstick in the same shade as the lips, and a lighter shade of lipstick in the middle part of the lips.