Will Estes (born William Estes Nipper, October 21, 1978 in Los Angeles, California) is an American actor best known for his role as JJ Pryor, on the NBC drama American Dreams. In 2010, he joined the cast of Tom Selleck's new CBS police drama Blue Bloods. In the series, he plays Jamieson "Jamie" Reagan, a New York Police Department officer and the younger son of the fictional police commissioner, played by Selleck.