He also shared a video of his crew getting ready for a sleigh ride at Jada's behest, joking, "Yeah, see? Willow's infected with that Christmas stuff, too."
They were all handed jingle bells and proceeded to carol in the sled -- which, honestly, looked like a whole lot of fun. Will couldn't remember the lyrics to "12 Days of Christmas," and you've got to hear his hilarious version:
At the Bright premiere earlier this month, Will opened up to ET about Jada and Jaden's Christmas spirit.
"Jaden is getting very serious about Christmas. It used to be just Jada, and now Jaden is starting to yearn for Christmas time," Will explained. "He's got pajamas with footies for Christmas -- like, he's taking it too serious. We need some family time so he can deal with that."
"See, here's the deal: So, for the last probably 20 years, Jada has been bat raving looney about Christmas. Like, she goes really, really far with Christmas, and up until now, it's been like, us against her for Christmas, just to keep a little family sanity around Christmas," he added. "But now, Jaden is starting to flip to the other side, so I'm concerned that my family is going to go real Christmas wacky."
Looks like his fears came true!
Hear more from Will at the Los Angeles premiere in the video below.