The compliment Justin Theroux gives Jennifer Aniston the most will make you smile

Aw, Justin Theroux!

ET caught up with the writer and actor at Activision for the launch of the game, Call of Duty: Black Ops III, where he revealed the compliment he gives his wife, Jennifer Aniston, the most, is simply, "She's beautiful."

"Not to be corny, but it's true," he said. "So I constantly say that."

WATCH: EXCLUSIVE: Justin Theroux Thinks the Silent Treatment in Relationships Is 'Infuriating'

How nice!

Theroux is actually an avid gamer, and told us his mancave is really just "a little office I play in and a little chair that's set up."

Click through to see photos of the couple:

So, does Aniston ever join in?

"No. Jen does not play the game, and doesn't understand why I play the game, but she allows me to," he said. "She's nice enough to let me go away for a couple hours a couple times a week and play."

WATCH: Justin Theroux on Married Life With Jennifer Aniston: 'It Does Feel Different'

Well, that's what marriage is all about!

Watch Theroux gush even more about his wife below.

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