Passage: Sami Gayle (born January 22, 1996) is an American actress. She co-stars as Nicky Reagan-Boyle in the CBS series Blue Bloods.\n\nQuestion: Based on this passage, who plays nikki in the pilot of blue bloods?
Use reasoning to answer the following question.
Sami Gayle
To answer the above question, the relevant sentence is: She co-stars as Nicky Reagan-Boyle in the CBS series Blue Bloods.

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Therefore, the answer is Sami Gayle