详细介绍：Ryan John Seacrest (born December 24, 1974) is an American radio personality, television host, and producer. Seacrest is known for hosting t…Ryan John Seacrest (born December 24, 1974) is an American radio personality, television host, and producer. Seacrest is known for hosting the competition show American Idol, the syndicated countdown program American Top 40, and the KIIS-FM morning radio show On Air with Ryan Seacrest.详情