The 38-year-old actor, who played Queen B Regina George in the 2004 film, said she cannot wait to see how Tina Fey has transformed the popular teen comedy into its Broadway version, reported People magazine.
"I really hope I get an invitation, yeah. I would love to see it. I'm so, so curious about it," McAdams said.
The musical, which has long been in works, will open on Broadway on April 8 next year at the August Wilson Theatre.