Tonight's host is Topher Grace. onight's musical guest is The Killers. Sketches:"CNN Press Conference," "Trucker Talk," "Beaver Ranch Brothel," "Hardball," "Black Paramedics," "Art Dealers," and "The Not So Great Adventures of the Down and Out Dollar." Performances:The Killers perform "Somebody Told Me" and "Mr. Brightside."

SNL alumni David Spade returns to host with musical guest Jack Johnson. Sketches:"Martha Stewart Returns," "Art Dealers in Vail," "Deaf Judge/Idiot Doctor," "David's Stunt Double," Woomba," "Sherman Oaks Holding Cell," "Sean Penn's Celebrity Roast," "UPS Delivery Man," "Jingle Singers," "Bear City" (film), and "Dirt Ball and Burnout Convention." Performances:Jack Johnson performed "Sitting, Waiting, Wishing" and "Mudfootball" with G. Love.

That 70s Show star and Demi Moore's boyfriend Ashton Kutcher hosts. Musical guest is Gwen Stefani. Sketches::"Hardball," "MeHarmony.com," "Oprah," "The Push-Up Contest," "Kevin Federline," "Gays In Space," "Guest Preacher," "Action News 13," and "Nebulzitol." Performances:Gwen Stefani performs "Rich Girl" with Eve and "Holla Back Girl."

Cameron Diaz returns again to host SNL with musical guest Green Day. Sketches:"Papal Debate '05," "Extreme Makeover: Home Edition," "Michael Jackson" (cartoon), "The Barry Gibb Talk Show," "One-Star Hotel," "Woo! The Musical," "Sofa Warehouse," and "Spy Glass." Performances:Green Day performs "Boulevard of Broken Dreams" and "Holiday."