Please answer the following question by reasoning step-by-step.
The series has been renewed for its tenth season, airing in spring 2018.\n\nAnswer this question: when will the new season of who do you think you are start?

spring 2018
To answer the above question, the relevant sentence is: The series has been renewed for its tenth season, airing in spring 2018.

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So, the answer is spring 2018