The Sing star looked darling in a navy blue snowflake sweater and red buffalo plaid pencil skirt, both from her Draper James clothing line.
The holiday party, presented by Tiny Prints, was full of Christmas cheer. Witherspoon helped hand out gifts to some of the 30 deserving kids in attendance, pet a mini Clydesdale named Willow, and created some on-point holiday crafts.
The joyful outing wouldn't have been complete without a gingerbread dance, which we have to say, was pretty delightful. "Breaking it down in honor of @baby2baby's amazing work providing essentials for low income children!" the mom of three captioned the Boomerang clip on Instagram. "Big thanks to @tinyprints for sponsoring this magical holiday party."
And clad in her own Draper James line, the adorable actress held up a banner that spelled out "believe" in red letters over seven red-and-green striped triangles. She was even wearing matching scarlet lipstick and a floral skirt covered in wreaths.
"Who else is getting in the Christmas spirit!? ? #LetTheCountdownBegin ❤️," she wrote on Instagram.
Witherspoon is far from the only celeb reveling in the holidays. Check out who else has been showing off their Christmas trees, celebrating with family, and going mad for decorations in the gallery below.