Jennifer Aniston throws Justin Theroux a star-studded birthday bash

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While there were rumors flying that Jennifer Aniston and Justin Theroux were going to tie the knot on Saturday (August 10), a different kind of celebration took place at the star's Bel-Air home: a birthday party!

When no-parking signs were spotted around the "We're the Millers" star's home and her hairstylist Chris McMillan was seen arriving there around noon, many thought the two were getting married. But they were actually just celebrating Theroux's 42nd birthday -- which turned out to be quite the star-studded affair. 

A-list guests like Dax Shepard, Kristen Bell, Isla Fisher, Sacha Baron Cohen, Jimmy Kimmel, Tobey Maguire, Jason Bateman, Ben Stiller, Ellen DeGeneres, Portia De Rossi, Christa Miller, Jen Meyer, John Krasinski, Don Cheadle, Lake Bell, Scott Campbell, Will Arnett, and Laura Dern were among the 80 guests in attendance.

The wedding rumors -- while false -- were not totally ridiculous, as the day not only marked Theroux's birthday but also the couple's one year engagement anniversary.

Photo/Video credit: Getty Images