Turns out, the "Smoke Break" singer loves the holiday and can't wait to celebrate with her hubby, Mike Fisher, and 7-month-old baby, Isaiah.
"This is gonna be our first Halloween with Isaiah," she gushed in ET's exclusive behind the scenes sneak peek at her Parade cover shoot. "I think I'm gonna have a lot of fun trying to find a costume for him."
Underwood poses in sexy red lace and festive ears for her close-up, holding each of her beloved pooches -- Ace and Penny -- in her arms.
"Ace is horrified of thunder or fireworks," she revealed. "Penny, I don't think she's really afraid of anything."
Penny must get that from her mama, who admits that she's "a total horror movie buff."
"For Halloween, our house is like the fake headstones in the yard, and there's pumpkins and stuff on the stoop," she says. But most importantly, Underwood is always stocked up on candy for trick-or-treaters!