The actress – who plays a cunning Broadway producer on Smash - said she was very impressed by talented cast who perform The Marilyn Musical in the season-ending episode.
"The dancers are so great. And getting to watch Katharine McPhee and Megan Hilty do what they do so well has been a delight. It's really something," she disclosed to ET Online. "I get a bit jealous [laughs] and then I see how tired they are."
Huston went on to reveal that she will sing for the first time on Smash very soon.
"We have [the] big full cast musical number coming up that I get to sing in, so that's fun," the star said. "I look forward to more next season, that's for sure!"
It was reported last week that Theresa Rebeck will be stepping down as Smash's showrunner prior to the second season.
Smash airs Mondays at 10/9c on NBC.
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