Just why is country upstart Juliette Barnes so darn right nasty? She got it from her mama! Our pals at Zap2it caught up with Juliette's portrayer Hayden Panettiere, who revealed a little about what makes the Nashville vixen tick.

Said Panettiere:

"You have to respect her to a certain degree," Panettiere says, "even though she is a little b*** at some times. She is running from a very dark past."

To learn more about how growing up with an addict mama informs Juliette's bitchy behavior, click here!

Nashville premieres at 10 pm EST tonight on ABC.