On Halloween, the American Idol alum dressed up as Will Ferrell's hilarious character in the 2003 holiday comedy, Elf. As for her husband, Brandon Blackstock, he successfully channeled Chris Hemsworth's character in Snow White and the Huntsman.
"Happy Halloween from the Huntsmen and Buddy the Elf #santascoming #iknowhim #embarrassingcostumesrthegreatest #mymomcantbelieveimpostingthis," Clarkson tweeted on Monday night.
This is the mother of two's second Halloween costume. On Friday night, Clarkson dressed up as Sia and performed "Chandelier" on Facebook Live. "Welcome! Hey, what's up? I'm Sia this Halloween. What?!" she announced. "She's one of my favorites, so I thought I'd wear a wig and be Sia. I'm gonna cover a Sia song right here real quick, and I'm gonna talk to you."