The married reality TV couple already took their baby son Gunner Stone to meet Santa Claus.
And on Tuesday the duo took the little boy, aged two months, to help them pick out a Christmas tree for their new Los Angeles home.
Heidi looked slender already in her black and red plaid shirt worn over a black T-shirt.
The 31-year-old Colorado native added skinny jeans and light grey sneakers.
Spencer looked much more summery in a red T-shirt with olive green shorts that went to the knee and grey sneakers.
He also had large crystals around his neck. He has spent a reported $30,000 on crystals as he believes in their healing powers.
Pratt was kiss happy as he was seen smooching both his The Hills star wife as we as his new boy.
The child looked sleepy at one point as he was wrapped in a plaid blanket.
The couple have been nesting nicely since moving out of his mother's Santa Barbara home.
The couple looked overjoyed as they took Gunner to see Santa Claus for the very fist time in his life.
Proud mom Heidi cradled her slumbering baby boy as she sat beside Kris Kringle and her husband, 34, during their session with Santa.
'@gunnerpratt fist time seeing Santa! it was a last-minute decision so we don’t look festive #babysfirstchristmas #christmas,' Heidi captioned the photo.
The parents smiled wide for the cameras as they sat beside Santa while Gunner napped away in his mother's arms.
It's been a big month for the couple, who welcomed baby Gunner on October 1.
Not only were they able to take Gunner to see Santa, but their son also celebrated his very first Thanksgiving.
Heidi shared a sweet family photo from the holiday as her husband held their baby in his arms.
'This was the best Thanksgiving of my life!' she gushed in the caption. 'So thankful for my family! @gunnerpratt first Thanksgiving! Also the first holiday I have hosted at my house.
Heidi and Spencer, who shot to stardom on the hit MTV reality series The Hills, also celebrated their ninth wedding anniversary earlier this month.