美國(guó)達(dá)人 第四季是大導(dǎo)演未知的一部?jī)?yōu)秀的歐美綜藝 類(lèi)型影視作品,主演有大衛(wèi)·哈塞爾霍夫 珊農(nóng)·奧斯博內(nèi) 皮爾斯·摩根 。影片的關(guān)鍵詞是未知, The fourth season of America's Got Talent, an American television reality show talent competition, premiered on the NBC network on June 23, 2009. Country singer Kevin Skinner was named the winner on September 16, 2009. This season is the first season to be broadcast in high definition.