PHOTO: Jennifer Aniston's Engagement Ring

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Hiding no more!

Jennifer Aniston showed off quite the rock while out with fiancé Justin Theroux in Santa Fe, New Mexico on Saturday.

Theroux was visiting the actress, 43, who's currently filming We Are the Millers in New Mexico, when Aniston reached up to touch his face, baring the bauble.

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The couple became engaged Aug. 10 after dating for more than a year when Theroux proposed to Aniston on his birthday.

"Everyone is really excited for them," a source told WHO Magazine at the time. "It's amazing to see how happy Justin makes Jen, and everyone was always hoping that he would propose."

"They are great friends," anothe source added at the time.

During an interview on Good Morning America the next month, when asked about her personal life, Aniston couldn't hide her emotions.

"Yes, I'm very happy. I'm extremely lucky, and I'm extremely happy," she said.

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