Jennifer Aniston Dress Shows Off Results From Bizarre 'Smiling' Diet (PHOTO)

Jennifer Aniston recently stunned onlookers when she stepped out in a revealing dress for an event in Los Angeles, and the actress appeared to show off the results of her bizarre new diet.

Aniston, 43, attended the LACMA 2012 Art + Film Gala with her fiancé Justin Theroux, 40, and despite flaunting her rumored $1 million engagement ring at the star studded event, it was her black floor length Tom Ford gown which set tongues wagging. The low cut, fitted number exposed much of her chest area and fans attributed her flawless appearance to an unusual diet that the actress has implemented.

''I stopped dieting when I figured out that you just have to eat regularly and properly within moderation," Aniston reportedly told Britain's OK! Magazine.

''The fads are too much. I think it's really about -- honestly, this is going to sound silly -- going in the sun for 20 minutes a day is really important, vitamin D, because we are now having a vitamin D deficiency because of all the SPF. And I think being happy and smiling and laughing a lot," she explained.

The former "Friends" star had plenty to smile about as she mingled with her fellow Hollywood A-listers including Cameron Diaz and Salma Hayek as her recently confirmed engagement to Theroux reportedly became a prime focus during the evening.

"Her ring is huge!" one onlooker at the event told Us Weekly magazine.

Aniston accepted Theroux's proposal in August and her stunning oval-shaped diamond ring has since become a hot topic among fans. One expert weighed in on just how extravagant her engagement ring may be.

"If this is a fine quality diamond of at least 10 carats, which it looks to be from initial photos, we could be talking about a million dollar ring here," gemology and jewelry expert Anthony Sarkissian of Beverly Hills' Premier Jewelry Lenders previously told

"Ten carat and over diamonds command a premium price in the diamond industry, because they are more rare than smaller diamonds. The ring looks to be a Cushion Cut or Oval Shape diamond, mounted in a classic Halo design. It may have Micro-Pave diamonds around the center stone as well," he added.