Jennifer Aniston and Justin Theroux Are Married! 

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Jennifer Aniston and Justin Theroux have made it official!

The couple exchanged vows in front of more than 70 family members and friends on Wednesday at their Bel Air, California, home, sources confirm to PEOPLE. "Guests were told it was a birthday party for Justin," says a source. "Jen and Justin wanted to surprise guests and guests were certainly surprised."

For the celebration, a large wooden deck was set up in the couple\'s backyard, filled with cozy nooks for lounging as well as elegant seating arrangements for 74 festooned with low, casual ottomans. A raised stage on one end, and a bar on the other, flanked the intimate setup.

pals Courteney Cox and Lisa Kudrow, as well as Chelsea Handler, Howard Stern and Beth Ostrosky Stern, Jason Bateman, Emily Blunt and John Krasinski, Sandra Bullock, Ellen DeGeneres and Portia de Rossi, Will Arnett, Tobey Maguire and Jennifer Meyer, Lake Bell and Scott Campbell, Terry Richardson, Jimmy Kimmel, Billy Crudup, Sia, Kathryn Hahn and Whitney Cummings.

Party staffers were spotted bringing in a large cake topped with two puppet characters, and a man who appeared to be a pastor was seen arriving on the grounds, according to TMZ.

The backyard of Jennifer Aniston and Justin Theroux\'s Bel Air home

Aniston, 46, and Theroux, 43, got engaged in August 2012 after more than a year of dating.

star opened up to PEOPLE about her fiancé of almost three years.

"Justin was the best thing this decade," Aniston admits about her 40s.

She also gushed about him in July 2014, saying, "He gets better every year."

"He\'s just so beautiful and handsome to me," she said at a dinner honoring

star. "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."

RELATED: PHOTOS: Jennifer Aniston\'s Beautiful Backyard Wedding

Theroux was equally as smitten with his longtime love, calling her "gorgeous" as he promoted his HBO series last year and admitting that their approach to marriage involved anything but cold feet. "We have hot feet," he joked.

As for Aniston\'s engagement ring, "I just think it\'s so beautiful," she told PEOPLE in June. "I\'ve never had anything so big on my hand. But I love it because he picked it and put it into a setting and it\'s simple. It doesn\'t feel gaudy."

star added that Theroux may switch up his own chunky gold ring – which currently spells out his name – now that he\'s a married man.

"When we get married he will be wearing his ring. It just won\'t say

"We were friends for seven years. I replay when I met him then, but he wasn\'t a boyfriend," Aniston said. "It\'s funny to replay it because we weren\'t even anywhere in each other\'s realms of possibility."

and were first romantically linked in May 2011, "both have the same work ethic and love to bounce ideas off each other," a source told PEOPLE in March 2014. "Jen seems more confident than ever, and they\'ve become a great team."

Added another insider: "It\'s amazing to see how happy Justin makes Jen."

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