Jennifer Aniston shares how she perceives beauty

Jennifer Aniston is PEOPLE's 2016 World's Most Beautiful Woman!   

Jennifer Aniston may be one of the most gorgeous stars in Hollywood, but she was still humbled and "very, very flattered" when she first heard the news that she was being named the Most Beautiful Woman in the World.  

The actress, who says she's learned to embrace her appearance over the years, insists she feels her best when she's healthy and strong.   

"It's funny, it's a really quick transition from not a care and now all of a sudden, we've got to really be mindful of what we put inside our bodies," she adds.  

"And how we sleep and take care of ourselves. You can get away with a lot in your 20s."   

Now the actress mixes it up by exercising at least six days a week for about an hour each day and watching her diet. But that doesn't mean she won't indulge in her favorites.  

From chips and guacamole to her husband Justin Theroux's pasta carbonara, which they make together every couple of weeks, "I'm not as strict as I was," she says.

"It was always sort of a monitored watch. Then I thought just give yourself moderation."  

As for her natural look, the actress gives full credit to her glam squad for teaching her "everything that I know!  

Whatever was happening before was just unfortunate," says the star, adding that she now knows how to contour her cheeks and blow out her hair.  

"When I was in my 20s, my face was almost a complete circle. So I really needed contouring. And now I'm slowly chiseling away, wishing I had that round face back."   

"But I'll never do it. Never. I'm a long hair girl. It's like a security blanket."   

How does Aniston define beauty?  

"Inner confidence. Peace. Kindness. Honesty. A life well-lived," she says.  

"Taking on challenges and not feeling shame for things that haven't gone the way you felt they should have. And not feeling like a failure or allowing people to critique your life and make you feel like you've failed at something. That's just toxic noise."

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