Megan Hilty and Debra Messing

How far will Smash's Ivy Lynn go to win the part of Marilyn Monroe?

"She's dying to make that next step and she's willing to do just about anything to make it happen," Megan Hilty tells TVGuide.com. "Some people [aka Ivy] go a little farther than others."

Decoding Mount McPhee: Is it a Smash spoiler?

Hilty stars in the NBC series opposite Katharine McPhee, who plays Karen Cartwright, an ingénue also vying for the coveted role. "You'll find out who gets it first very soon," Hilty says, emphasizing the word "first" and implying that that casting may not be permanent. "The thing about making a musical is that you can and will be replaceable really quickly."

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Smash airs Mondays at 10/9c on NBC.