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Jennifer Aniston, Justin Theroux

Jackson Lee / Splash News

This calls for a celebration!

A source tells E! News that Jennifer Aniston is planning a very special birthday bash for fiancé Justin Theroux this weekend at their Los Angeles home.

In honor of the actor's 42nd birthday on Saturday, Aniston is planning a massive party with close friends at her newly renovated Bel-Air mansion.

But Theroux's birthday isn't the only major milestone that is cause for celebration…

It turns out that it's also the couple's one-year anniversary of their engagement!

Tthe rumor mill has gone into overdrive with reports that the two were set to walk down the aisle this weekend, but for now all signs point to it being strictly a birthday party. 

The future Mrs. Theroux set the record straight about her wedding plans to ABC News and said that the two "already feel 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."

"We have yet to set any dates. There have been no canceled weddings. There have been no postponed weddings," the We're the Millers star said.

"There have been no arguments about where to get married. Just clearing all that up."

But back onto the subject of birthdays, we're certain Theroux will be delighted with the celebration that his leading lady has planned!