10 celebs we'd like to see guest star on 'Downton Abbey'
Colin Firth, Winona Ryder and yes, James Spader are all on our short list
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There aren't many 18-year-olds with Ronan's acting chops, which is all the more reason to find a job for her downstairs. With her Irish background, she could easily slip into the roll of a recent immigrant in search of work -- and we think she's up to the task of kindling a romance with one of the manservants. Just, please, not untrustworthy Thomas.