Jennifer Aniston threw her husband-to-be a grand 42nd birthday bash on Saturday.

Several of their A-list celebrity friends joined the party, which was held at the couple's new California home. Dax Shepard, Kristen Bell, Isla Fisher, Sacha Baron Cohen, Ben Stiller, Ellen DeGeneres, Portia De Rossi, Tobey Maguire and Jimmy Kimmel were some of the attendees. The celebrity guests were allegedly invited to the couple's future wedding, according to a Good Morning America broadcast on Monday.

"Justin was hanging out with Scott Campbell and Dax Shepherd at the beginning of the party," a source told E! News. "They were having a great time laughing and joking around. Jen was nearby talking to Mandy Ingber and Isla Fisher. She was hugging her friends and talking closely with them most of the night."

Initially, the party was rumored to be the pair's surprise wedding, but Aniston previously said that they are in no rush to tie the knot.

"We have yet to set any dates. There have been no canceled weddings. There have been no postponed weddings. There have been no arguments about where to get married. Just clearing all that up," the 44-year-old actress told The New York Daily News in July.

Aniston and Theroux, who have been engaged since August, are waiting for some down time in their busy work schedules to get married.

"We just want to do it when it's perfect, and we're not rushed, and no one is rushing from a job or rushing to a job," Aniston said. "And you know, we already feel married."

Despite her unknown wedding date, Aniston is already set in how she plans to wear her hair on the special day.

"For my wedding, I wouldn't do an updo, but I think a veil is always pretty," she told Marie Claire in a June interview. "I like loose and natural hair because it goes against the formality of the dress. Loose, like 'I just got out of bed, maybe had a romp' hair."

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Jennifer Aniston, Justin Theroux