Justin was seen driving the couple to Mr. Greentrees in Beverly Hills, accompanied by their bodyguards, where they picked out the prefect Christmas tree for the festive season.
"They looked at several trees," a source told E! "Jennifer seemed excited about a big noble fir and Justin agreed with her.
"She was very nice and jovial," added the source. "Talking to employees at the lot and humming along to the Christmas music."
Jennifer and Justin's Christmas tree will no doubt stand pride of place at the dream home they moved into back in May.
The engaged duo finally moved into their 8,500-square foot Bel-Air mansion, having bought it a year and a half earlier.
Extensive renovations were carried out on the luxe property, transforming it into Jen and Justin's dream pad.
The sprawling property boasts a swimming pool, a separate guest house, a vineyard, wine cellar and projection room.
With so much space away from prying eyes, perhaps Jen and Justin will consider holding their wedding within the grounds of their new home. The happy couple, who got engaged last August, are expected to tie the knot very soon.