"You either get the anthem right or you don't, first of all," the country superstar recalled to Jimmy Fallon while reliving the nerve-wracking experience on Sunday's The Tonight Show.
"Sometimes, I see a bus going by with a poster on it I think, ‘Damn, I look hot. Oh, wait, that's not me,'" she said of her apparent celeb doppelganger.
The Glee alum, Mindhunter star and Broadway actor also recorded a sweet voicemail to Jimmy Kimmel's daughters on The Tonight Show Starring Jimmy Fallon.
E! News confirmed in October that the actress has signed on to the untitled show, in which she'll play a character described as "a charismatic socialite hiding a dark secret."