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No reason was given, but Smallville actress Allison Mack checked in to prison early. Mack was not required to be there until September 29th, but apparently arrived on September 13th. She was sentenced to three years behind bars for her role in the NXIVM sex cult. She'll serve her time at the same prison that housed actresses Lori Loughlin and Felicity Huffman in Dublin, California.