The A-list couple has been together for more than four years and have been very supportive of each other since the very beginning.
Both Aniston, 46, and Theroux, 43, both have gushed about one another well before tying the knot.
Here are their sweetest quotes over the years:
Luckiest Guy in the World
In 2012, months after they started dating, Theroux basically put all other guys to shame, saying, “I always go to bed thinking I'm the luckiest guy in the world.”
He added to Extra, he “could not be happier” with Aniston.
He's a Protector
Around the same time, Aniston had amazing things to say about her new man to Marie Claire.
"He's a protector, for sure," she told the magazine. "He’s just a good human being, and so funny."
Later that year in October, Aniston got choked up when she revealed to Chelsea Handler she was engaged. The couple got engaged around Theroux's birthday in August, 2012.
"I just got verklempt," she said, after tearing up and then Handler said, "He's the greatest guy ever and you guys make the greatest couple ever and I'm so happy for you too."
We're Just Really Happy
The next year, Aniston told "The Talk" about the couple's lengthy engagement. "We're just really happy and we're in love and we feel like we're married," she said. "Eventually we're going to get married when we find the time. I don't feel like there's a rush."
Then in 2014, Theroux said in July that his upcoming birthday would be "hard to top [two years] after the proposal."
That same month, Aniston spoke to Women's Wear Daily and couldn't stop gushing about her talented actor/producer fiance.
He's Just So Beautiful
"He's so graceful and utterly kind and golden," she said. "He's just so beautiful and handsome to me ... 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."
Finally, earlier this year in January, Aniston told InStyle how what initially drew her to Theroux.
"I remember thinking, 'Isn’t he hot?'" she said.
Aniston also spoke to Glamour magazine a few months back and said, "I feel beautiful when I wake up with my sweetheart."
Well, the married couple will be waking up next to each other for years to come.