"They haven't asked me, but I said I love that show," Susan told Access Hollywood at the Donna Karan Spring 2011 show during Mercedes-Benz Fashion Week on Monday in New York City.
The actress, who played Janet Weiss in 1975's big screen version of "Rocky Horror," told Access that her musical abilities aren't exactly worthy of being in New Directions.
"I can't sing or dance, so I don't know how they would use me," she continued. "I'm not a very good singer, but I love the fact that they are doing it and I'd be supportive in whatever way I could be."
"I think it's fabulous. I'm sure they'll rock it!" she added.
"Glee's" Season 2 premieres on September 21 at 8 PM on FOX.
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