TV stars are lending their voices to the Emmy Awards for an American Idol-style competition. The stars will sing TV theme songs and viewers can vote for their favorite performance online. Megan Mullally (Will & Grace) will team up with Donald Trump (The Apprentice) for a Green Acres duet. Kristen Bell (Veronica Mars), William Shatner (Boston Legal) and Gary Dourdan (CSI: Crime Scene Investigation) will also contribute. The Emmys air Sept. 18 on CBS and will be hosted by Ellen Degeneres.