The 40-year-old singer shares Max with ex-husband Jordan Bratman, 43.

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Christina shared a rare photo with her son Max on InstagramCredit: Instagram

The singer shared a new post that documented her Christmas celebration on MondayCredit: Instagram

One snap captured Christina hugging Max as they sat on the floor.

The mother-son duo both donned soft smiles as they looked comfortable in sweatpants during the low-key Christmas festivities.

She captioned the post: “holiday photo dump – stay home edition ❤️🏡🌴❄️🎅🏼”

The first photo in the post showed Christina wearing a pink bikini and a Santa Claus hat, while her longtime partner Matthew Rutler got into the holiday spirit as he sported a fake white beard.

She celebrated with her kids and partner MatthewCredit: Instagram

The couple brought snow to Los AngelesCredit: Instagram

Their daughter Summer Rain also appeared in the photosCredit: Instagram
The singer also shared a video of Matthew, 35, swimming toward the camera, followed by another clip of her partner blasting snow from a machine into her yard.

Christina was heard in the back of the clip stating: “This is how we get snow in L.A.”

A following clip showed Christina’s dogs playing in the snow, while another snap showed Christina and Matthew posing with their dogs as they held up champagne glasses in the snow.

The family celebrated the recent holiday at homeCredit: Getty Images

Christina and Matthew got engaged in 2014Credit: Getty Images – Getty
Another photo caught the singer’s six-year-old daughter Summer Rain- whom she shares with Matthew- taking a nap on the floor while surrounded by Christmas presents.

The post concluded with a shot of Christina and Matt in the pool as the singer gave her fiance a kiss on the cheek.

The Beautiful singer married Jordan in 2005, while they finalized their divorce in 2011.

She began dating Matthew in 2010 and the couple became engaged in 2014.

She was married to Jordan from 2005-2011Credit: Reuters