American Music Awards nominations are out! In the male pop-rock artist category, American Idol runner-up Clay Aiken is competing with the big boys — Kid Rock, John Mayer and Justin Timberlake. Meanwhile, Celine Dion snagged two nods: The one for favorite adult contemporary artist puts her up against Cher and Norah Jones. The other, for fave female pop-rock artist, has her vying with Avril Lavigne and J.Lo. Eminem got nods for favorite male rapper and the 8 Mile soundtrack, while Sean Paul and Missy Elliott also are up for hip-hop honors.