Tina Fey didn't know she worked with 'Mean Girls' star on '30 Rock'

Tina Fey says that casting Gretchen Wieners in the new 'Mean Girls' movie musical was a tough task – and she ended up choosing an actress she'd worked with on '30 Rock' without realizing it.

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Tina Fey didn't know she worked with 'Mean Girls' star on '30 Rock'

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