Carrie Underwood joined all the other American Idol winners at a private party on Thursday night (Feb. 12) to launch a new attraction at Walt Disney World in Lake Buena Vista, Fla. The American Idol Experience will open to the public on Saturday (Feb. 14). David Cook, Jordin Sparks, Taylor Hicks, Fantasia Barrino, Ruben Studdard and Kelly Clarkson also performed. Idol judge Paula Abdul and host Ryan Seacrest demonstrated the new attraction, which features amateur singers performing in the theater for judges (who are actually actors), while the audience decides who gets a "golden ticket" for a real audition. Underwood sang "All-American Girl" and joined Cook for a duet on Fleetwood Mac's "Go Your Own Way."