James Shaw / REX / Shutterstock / Rex USA 1 / 7
James Shaw / REX / Shutterstock / Rex USA 1 / 7

Ever wondered how Catherine Zeta-Jones keeps her youthful complexion? Well, get out your notepad, because the 46-year-old is now sharing her tips.

Catherine opened up about how her grueling schedule has affected her skin in a webchat on Mumsnet while promoting the release of her new film "Dad's Army."

"I'm finding, just from traveling from New York and being in heated hotel rooms, my skin feels like a Walker's crisp at the moment, but I've been using some argan oil just to saturate my skin at night, so it has some nourishment as I sleep, to start the day a little bit more hydrated."

While argan oil does its work from the outside, the Oscar-winner said there's a more important way to keep from drying out.

"The real hydration comes from within. You can never drink too much water," she added. "No diet sodas!"

Argan oil, which comes from nuts on an argan tree, has been used for a long time by Berber women in Morocco to treat a variety of things, including dry skin, wrinkles, stretch marks and more.

According to the actress, though, a person can use as much oil or drink as much water as they want, but the real secret lies within.

"I think happiness is the best tonic for keeping us youthful. Being happy with who you are inside radiates on the outside," the wife of Michael Douglas, 71, admitted.

During the webchat, Catherine also discussed ageism in Hollywood.

"I have been in the business since I was nine years old, and have heard the same thing said throughout the different parts of my career. Then, hello, I'm in my 40s... and it's true. It's not that there aren't great stories to be told about women in their 40s, it's just that the big bosses in Hollywood feel that the demographic of moviegoers are less interested."

She also compared the age judgment to the current hot topic of racial diversity.

"There's talk in Hollywood about diversity right now, and it's a good conversation to be had, and necessary, but when say diversity, let's mean diversity for actors with ethnic differences, age differences, and sex differences... Let's go back to the writers, to the film-makers and more importantly the studios who finance movies, to get them to have projects where diversity has a chance."