"I had to really pull from my gut on this whole role I was playing because I'm a very, strong confident person," the country star says, noting that she was portraying " a more subdued, naïve character" than herself. "I really had to really transform my personality which I wasn't sure I could do until I got on the set and sort of just tried to put myself in her shoes."
In the episode airing Wednesday at 10/9c on NBC, she plays Lacey Ford, an aspiring actress who falls under the spell of a nefarious producer (Michael McKean). Lambert says it helped that her first role was that of an actress. "This was really nerve-racking all around, but also exciting because I've never acted before," she says. "And then playing an actress trying to get a role, it was like an audition within an audition. It was sort of my audition for myself to see if I could even act at all."
Watch an exclusive first look at Lambert's appearance here: