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Justin Theroux, Jennifer Aniston

Gregg DeGuire/WireImage

Despite being engaged for several years before finally tying the knot in August, Justin Theroux says marriage has totally changed his relationship with Jennifer Aniston for the better.

During an interview with Good Morning America on Wednesday, the actor couldn't help himself from gushing about his wife to co-anchor Robin Roberts.

"It's fantastic," he said of their marriage. "Something really does shift in a wonderful way and it sort of refocuses things and in a weird way I was sort of…it was a long time coming, but also put us in exactly sort of the right space…it's a wonderful thing."

When asked to elaborate on the shift marriage brought to their love, he added, "I can't quite explain what it is. It goes beyond sort of having a ring on your finger or anything. You relax into it in a certain way."

As for the wedding itself—which took place at the couple's Bel Air home last month—Theroux says there really was no better person to officiate the wedding than Jimmy Kimmel.

"It was the biggest blessing in the world," he said. "It was exactly what you would want him to do. He was extremely funny, kept things extremely light, was extremely touching."

Theroux even revealed that Kimmel cried a little bit! "He did, and then everyone did," he dished. "And it was just…it was the perfect tone for the night."

The Leftovers, Justin Theroux

Van Redin/HBO

Other than the excitement of being newly married, Theroux is also busy with his career.

The second season of his HBO series The Leftovers premieres on Sunday, and the actor says it takes a step up from the first season.

"It becomes a weirdly more psychological, emotional drama," he explained. "It's not quite as bleak as the first season." 

Theroux is also looking forward to his appearance in Zoolander 2, which will hit theaters next year. But the real question remains: Has he mastered the "blue steel" look yet?

"I don't have a blue steel," Theroux said, laughing. "There's really only one guy who can do it."

We'll hand it to him on that one!