Of course, we're referring to her radiant skin which has been the envy of women for decades, and luckily for us all, the 45-year-old stunner is spilling her secret to her flawless appearance.
"I just take care of my skin, eat well, exercise," the InStyle cover girl, who has previously said that she's "not a fan" of Botox, tells the February issue of the mag. "And I love lasers and [other noninvasive treatments like] Thermage [radio frequency] and Ultherapy [ultrasound]. I also like a good microcurrent facial."
As for why Aniston has chosen not to go under the knife like many of her Hollywood counterparts?
"People lose perspective. I look around and see how bad plastic surgery and injections can really kick you in the ass," she explains with years of Tinseltown wisdom.
Aniston, who is the face of Aveeno skin care, also attributes her ageless appearance to basic sleep and water, which she says are "your best bets for really great skin." Additionally, she sees a naturopathic doctor, who recommends taking fish oil and a probiotic, and when it comes to makeup, the gorgeous stunner swears by "everything from Chanel."
(Of course, good genes don't hurt, either.)
While Aniston may be known for her impeccable look, fans can see a different side of the star in her latest movie Cake, in which she plays a woman in a chronic pain support group who develops a relationship with a widower after his wife's suicide.
The Friends star opted not to wear makeup for the role—a feat, which, as InStyle points out, she has done before—although this time, she also didn't work out and also wore prosthetic scars on her face.
"This one, well, she's really banged up," she says of her character in the film, which has already generated Oscar buzz for the star. "For two months there were no mirrors to look at, no manicurists. Nothing. The hardest part for me was when they said, 'Don't work out.' I said, 'But I have to.' And then I realized, Oh. When you're not working out, your levels of joy just go down, down, down. And it's not that easy to get the weight off once you stop working out. You say to your body, 'Hey, what's going on?' But that's just the 40s."