The 43-year-old actress selected a 10-foot Noble Fir Premium tree to add some Christmas spirit to the party, reported Us magazine.
"She likes (her trees) really full and fluffy," a source said.
Stars like Demi Moore, Ellen DeGeneres and Portia DeRossi, Tobey Maguire and Ben Stiller were spotted arriving at Aniston and Theroux's house.
"Aniston was merely celebrating the start of the holiday season by hosting her annual tree trimming party," the source added.
