American Idol fans will get a look at teen idol Miley Cyrus, but forget about seeing late-night victim Conan O’Brien on the hit show. Miley will be the special guest on Tuesday’s Idol, mentoring the remaining 11 contestants — even though most are older than the 17-year-old star! Miley, whose movie The Last Song opens on March 31, is also set to sing her new single, “When I Look at You.” On the elimination show the next night, Miley’s best friend, Demi Lovato, will perform with her boyfriend, Joe Jonas, but deposed Tonight Show host Conan O’Brien won't appear on the show anytime soon. Conan was invited by producers to be on the "Idol Gives Back” episode scheduled for April 21, which this year will benefit the United Nations' Foundation Fund for Haiti, the Children's Health Fund and other charitable groups. But NBC is saying no to the charity appearance because Conan cannot appear on TV until May, according to the agreement he reached with the network when he was fired from Tonight.