Jennifer Aniston Throws 42nd Birthday Bash for Justin Theroux

Justin Theroux asked Jennifer Aniston to be his wife on his 41st birthday and one year later,  Aniston threw a  birthday bash for Theroux  at their newly renovated Bel-Air mansion.

The engaged couple were joined last August 10 by many celebrity friends for the get-together, which was held on the palatial patio of their $21 million love nest.

Celebrities Don Cheadle, Malin Akerman, Laura Dern, and Lake Bell all drove up to the party in their cars solo. But there were several couples who attended such as Kristen Bell and fiancé Dax Shepard and Ellen Degeneres with her wife Portia de Rossi.

Aniston's co-star in the Horrible Bosses, Jason Bateman drove up with his wife Amanda Anka.

Tobey Maguire brought with him Jennifer Meyer, who is a jewelry designer. Meyer's leaf pendants made their debut in Aniston's The Break-Up movie in 2006.

The casually-attired stars eventually made their way into the couple's 8,500-square-foot mansion. Many of them mingled outside the 3.5 acre estate where a lot of candles were lit and hors d' oeuvres were served.

The extensive estate features a separate guest house, swimming pool, a vineyard, wine cellar, and a projection room.

The birthday party was originally alleged to be their wedding but it is clearly not the case.

The engaged couple remains silent about when and where their impending wedding will take place.

'We just want to do it when it's perfect and we're not rushed ... We already feel married,' the Golden Globe winner told the Associated Press in July.