Justin and Jennifer’s Engagement Party

Jennifer Aniston and Justin Theroux, threw an engagement party in their home in Beverly Hills, on Sunday, Dec. 2.

The two actors celebrated with close friends, including Ben Stiller, Ellen DeGeneres, Portia Di Rossi and Demi Moore, at a low key bash four months after announcing their engagement.

The atmosphere of the whole party was relaxed, and the guests were casually dressed as they came bearing gifts for the happy couple at around 7 p.m.

According to PEOPLE, the party was actually for both adults and children; a source told the magazine that “Jen loves having children around and she always has fun activities planned for them. While the adults mingled, the younger guests were able to color and play games.”

Aniston announced her engagement in August after Theroux popped the question on his 41st birthday.