Question: The season seven of "America's Got Talent", a reality television series, premiered on which date, Judge Piers Morgan left the show after season six and was replaced by radio personality Howard Stern?
Sentence (from "America's Got Talent (season 7)"): Because of Stern's commitments to his radio program, the live (post-Las Vegas) episodes moved from Los Angeles to the New Jersey Performing Arts Center in Newark, New Jersey.
Relevant evidence: No