Question: who is the actress that plays nikki on blue bloods
[{'answer': 'Sami Gayle', 'provenance': [{'wikipedia_id': '32692379', 'title': 'Sami Gayle', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '32692379', 'title': 'Sami Gayle', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 118, 'bleu_score': 0.673138834030618, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18368163420954793800}, 'section': 'Section::::Abstract.'}]}]