There were rumors that this weekend Justin Theroux and Jennifer Aniston were going to have a secret wedding, but instead the couple threw a celebrity filled birthday party for Theroux.

Ellen DeGeneres, Ben Stiller, Jimmy Kimmel, Tobey Maguire, Laura Dern, John Krasinski, Don Cheadle, Jason Bateman, Kristen Bell,Isla Fisher, Samantha Ronson, Will Arnett, Malin Ackerman and Dax Shepard were among the celebs who headed to Jennifer Aniston's Bel Air mansion Saturday night, according to People.

The party took place on the anniversay of the couple's engagement, which is why there was speculation that it might have been a private wedding celebration.

In the afternoon, guests hung around outside on the patio of the newly renovated $21 million, 8,500-sq.-ft. home, chatting and listening to music, according to People. Then they went inside to toast Theroux.

What would a great party be without food? Aniston's personal chefs prepared appetizer-style food with a relaxed buffet for about 75 guests. On Friday, a large shipment of Champagne had been delivered to the house.  Sounds like quite the party!

While there was no wedding, Aniston has said she and Theroux are just waiting for the right time.

"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," said Aniston. "And, you know, we already feel married."