"I commend him for his courage. This is not normal for him. He's so graceful and utterly kind and golden," Aniston told Women's Wear Daily at a dinner toasting Theroux's August cover.
"It is amazing. He's just so beautiful and handsome to me, and I love that his eyeballs are so beautifully captured because those eyes just knock me out every day," the actress said. "He just gets better every year. He's just like a lost gem in the sand, and he's just always been there and been brilliant, and now this is just in a different light."
Backing up Aniston was pal Courteney Cox, who brought along her own fiance, the musician Johnny McDaid.
"There's no better cover boy than Justin Theroux," Cox told WWD. "He's so handsome and cool."
For his part, Theroux, who stars on the HBO series "The Leftovers," said he felt at ease at the shoot, especially because he was able to help style it.
"They wanted me to incorporate my style," he told WWD. "I just brought basically old T-shirts and jeans - nothing major. It's always a bummer when you show up to a shoot, and they're like, 'Here's a pink leather [piece]' and you're like, 'I don't really want to wear that.'"
These days, the 42-year-old actor said he's dressing more age appropriately.
"I can't wear things that are totally ripped anymore or completely beaten to s***. That's a young man's game. As you get older, you have to clean it up a little bit," he said.