Jennifer Aniston, Justin Theroux Engagement Party: Ellen DeGeneres, Demi Moore and More Stars

Couple and friends gather at Friends star's Beverly Hills mansion on Sunday for "casual" event with about 50 guests

By Rebecca Macatee Dec 03, 2012 9:08 PMTags
Ellen Degeneres, Portia De RossiBlanco-Maciel-Juliano/X17online.com; Frederick M. Brown/Getty Images

Jennifer Aniston and Justin Theroux are celebrating their engagement with friends!

The We're the Millers star and her Your Highness fiancé were joined by Ellen DeGeneres, Portia De Rossi, Demi Moore, Tobey Maguire, Ben Stiller, Lake Bell and more pals Sunday at the couple's Beverly Hills home.

A source tells E! News the party started around 6 p.m. and lasted until midnight. "People were very casual, dressed casual, and came with presents," a source added. "About 50 people came, and some brought their kids."

Justin popped the question to his Wanderlust costar back in August. She (of course) said yes, tearing up when she talked about the special night on Chelsea Lately two months later.

We couldn't be happier for the future Mr. and Mrs. Theroux! Now, anybody know how to score a wedding invite?