Every star has a secret as to how they stay the way they are, and for the "Easy A" star Emma Stone, staying pretty is as easy as applying cooking oil on her. Yes, cooking oil, more specifically, grape seed oil. But is there proof as to why grapeseed oil is doing wonders on Stone's skin?

Stone, who will be playing the role of "Gwen Stacy" in the upcoming movie "The Amazing Spider-Man," told Style.com that she has sensitive skin, and uses cheap vegetable oil instead as moisturizer. The actress explained that she uses natural grapeseed oil bought from grocery stores and pats it on after taking a shower, ContactMusic.com reported.

But does this beauty secret have any merit to it? Does grape seed oil really work? As it turns out, yes. The cooking oil that can be bought cheaply indeed does have some benefits when it comes to the skin.

What's so great about grape seed oil is that fact that it is light, easily getting absorbed into the skin where it can work its magic, according to OilBenefits.net. Though light on the skin, it is heavy with antioxidants, which works wonders on preventing cellular damage.

Another remarkable benefit of the oil is that since it doesn't have that oily texture that some have, it is actually good against acne. This is because of the polyphenols which have an anti-inflammatory property; plus, grape seed oil also helps clear out the pores.

But it doesn't stop there. Grape seed oil contains other essential and non-essential fatty acids that can help the skin, like linoleic acid, oleic acid, palmitic acid, and palmitoleic acid, just to name a few.

Breaking it down, Linoleic acid is often part of any skin care product because it promotes healthy hair, skin, and would healing process as it is critical for the development and maintenance of a healthy skin barrier, according to ProsperOrganics.com. When it comes to oleic acid, though insects may produce them when their bodies decay, it is actually good for moisturizing the skin as well as having regenerative and anti-inflammatory properties.

As for the other two acids, palmitic acid helps shield the skin keeping the moisture in and the germs out; while palitoleic acid, a basic building block of the skin, shields it against wounds, scratches, and burns.