Tonight, Fox premieres the two-hour Carrie Underwood: An All-Star Holiday Special at 8 p.m. ET. Having watched a teaser reel of select performances - and a video imagining what her dog, Ace, is thinking as Carrie pays attention to men who are not him and tries to dress him in clothing - I can tell you what to expect: For starters, many, manycostume changes. Sadly, the bit this photo was taken from was not on the screener, so we will all have to wait to see if it's hilarious or horrifying. (Pretty sure I'll prefer Underwood and Parton in their color- and sequin- coordinated dresses dueting on "I Will Always Love You." Carrie is the only country singer who shows her legs as often as Dolly does. And she's sitting on a stool. I'm still not 100 percent sure she should be interacting with backup dancers, which she does on various numbers.)

There are more guests. Included in the preview was Underwood '60s Trio Medley with Kristin Chenoweth and Christina Applegate. They don hot pink dresses and wigs to sing "Will You Love Me Tomorrow," "Then He Kissed Me," "Leader of the Pack," and "Be My Baby." Brad Paisley and David Cook also perform. What are you most excited to see: Carrie's performances (which includes songs from her upcoming album, old hits and holiday classics), the mystery of that photo solved, the aforementioned video starring Ace, whatever Christmas cheer Paisley spreads, or Cook?