Will Estes (born William Estes Nipper; October 21, 1978) is an American actor known for his role as J.J. Pryor, on the NBC drama American Dreams. In 2010, he joined the cast of Tom Selleck's CBS police drama Blue Bloods. In the series, he plays Jameson "Jamie" Reagan, a New York Police Department officer and the younger son of the police commissioner, played by Selleck. The series is now entering its sixth season.