'Smash': Uma Thurman's Movie Star Gets a Reality Check (Exclusive Video)

"Bombshell's" director tells the production's new star to stop toying with her understudy in an exclusive clip from Monday's episode.
"Smash's" Uma Thurman

Uma Thurman's Rebecca Duvall is making a mess of Bombshell, the musical at the center of NBC's Smash.

STORY: 'Smash's' Uma Thurman Teases Rebecca Duvall's Impact: There's Drama Everywhere

The movie star character entered this week with a literal sour note when during rehearsals as Marilyn Monroe she had a rather painful-sounding time navigating the musical component of the role, much to Karen (Katharine McPhee), Ivy (Megan Hilty) and the rest of the cast's dismay.

During Monday's episode, titled "Publicity," Duvall begins to sway Karen, seducing her with the glamorous life when she takes her under her wing.

EXCLUSIVE PHOTOS: 'Smash': Uma Thurman Steps in as Marilyn Monroe

In a clip exclusive to The Hollywood Reporter, Derek takes issue with Duvall's entitled attitude and her newfound closeness with her understudy, Karen.

Does Duvall have Karen's best interests at heart? Hit the comments with your thoughts. Smash airs Mondays at 10 p.m. on NBC.

Email: Lesley.Goldberg@thr.com; Twitter: @Snoodit