'American Idol' ends tonight (CNN) When Ryan Seacrest signs off "American Idol" tonight with his signature "Seacrest out!" he will mean it literally. The show is ending after 15 seasons, juggernaut ratings (which fell off in recent years), thousands of aspiring superstars and way too many covers of Whitney Houston songs. La'Porsha Renae and Trent Harmon are the final two contestants on season 15 of "American Idol." On Wednesday night, La'Porsha Renae and Trent Harmon were named as the final contestants for the title of "American Idol." 'American Idol' chooses its final two Fox has planned a blowout finale tonight that will include performances from judges Harry Connick Jr., Keith Urban and Jennifer Lopez as well as appearances by a bevy of alumni including Carrie Underwood, Jennifer Hudson, Chris Daughtry and Fantasia. Based on the popular British show "Pop Idol," the series ...