Output a stream of consciousness before answering the following. Passage: Sami Gayle (born January 22, 1996) is an American actress. She co-stars as Nicky Reagan-Boyle in the CBS series Blue Bloods.

Question: Based on this passage, who plays nikki in the pilot of blue bloods?
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To answer the above question, the relevant sentence is: She co-stars as Nicky Reagan-Boyle in the CBS series Blue Bloods.
The answer: Sami Gayle.
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