The engaged duo paid their annual visit to Mr. Greentrees in Beverly Hills Thursday, stopping by the holiday hot spot to pick out the perfect Christmas tree.
After arriving in their Mercedes with Theroux behind the wheel, the couple drove on to the lot and was escorted by bodyguards to the inside of the tent, a source tells E! News.
"They looked at several trees," the source continued. "Jennifer seemed excited about a big noble fir and Justin agreed with her. You could see she took her choice very seriously and made sure to pick out the perfect tree for their new house."
"She was very nice and jovial, talking to employees at the lot and humming along to the Christmas music," the source said.
After sticking around for about five minutes, they paid for their tree, asked for it to be delivered and headed out quickly.
Her manager Aleen Keshishian shared a photo of the A-lister posing with her and the British singer on Instagram, writing, "#HappyThanksgiving."
Happy holidays indeed.