‘Smash’ Star Katharine McPhee Doubts Karen and Ivy Will Ever Be Friends (EXCLUSIVE)

Celebs Love Marilyn
Today's stars channel Miss Monroe's style.
Smash fans were more than thrilled when they heard the news that NBC had renewed the musical drama series for a second season. Still, even with a new set of episodes, it’s unlikely we’ll ever see the feud end between characters Karen Cartwright and Ivy Lynn.

So says star Katharine McPhee, anyway.

“I think it’s going to be pretty challenging for there to be any possible chance of Ivy and Karen ever being friends,” Katharine, who plays Katharine on the series, told Celebuzz in a recent interview. “There’s still a lack of trust from both characters. It’s just about who’s going to get that part, and they can’t really get past that.”

What was it like working with Uma Thurman? Katharine explains after the jump!

Smash, which chronicles the making of a Broadway musical about legendary actress Marilyn Monroe, has been a rare success story for NBC. In addition to receiving rave reviews, the show has allotted many guest stars along the way.

Among the stars: Oscar-nominated beauty Uma Thurman, who joined the show for a five-episode arc as Rebecca Duvall, a movie star who steps in to save the struggling production.

As McPhee explained, even Uma had her own bout of stage fright.

“She was really open on set about how she was really nervous,” she said. “I think it’s sweet she voiced that, because it allowed people to understand the space she was in. She’s so good at being bad on the show.”

Katharine, 28, got her first taste of fame as a contestant on season 5 of American Idol, in which she placed second. It’s an experience she’s often reminded of while filming Smash, thanks to NBC’s other success story, The Voice, which films on a neighboring stage.

“I keep asking them, ‘Are you excited? Is it fun?'” she said, of the times she’s bumped into Voice contestants. “The same questions that I was probably asked a million times. [Laughs] It’s fun to see them cause I’m a fan.”

Smash — which will return to NBC in 2013, at midseason — airs Monday nights on NBC. For more on Smash, read our exclusive interview with Katharine’s co-star, Megan Hilty!