updated 12/06/2013 AT 9:30 AM ET
•originally published 12/06/2013 AT 10:25 AM ET
Some holiday traditions are too important to not do yourself – and when it comes to picking out a Christmas tree, Jennifer Aniston and Justin Theroux don’t put on airs.
The glamorous pair ventured out of their sprawling Bel Air mansion to personally pick out a tree – in this case a 10-ft. Noble Fir from Mr. Greentrees in Beverly Hills that Theroux paid for.
“Jen picks her own Christmas tree every year,” says a witness. “It’s a tradition for her. She’s very specific about the tree that she wants. ”
At the tree lot, “Jen was in a great mood and took her time to pick out the perfect tree,” says the witness. “Justin helped her and she found a beautiful one.”
This is the third year in a row that the couple – who have kept a low public profile for the past month – have picked out a Yuletide conifer together.
It’s part of a cherished Aniston tradition: her annual tree-trimming party for close friends and associates.
“The tree will be delivered in time for her party,” says the witness.