Who does former 'American Idol' contestant Kellie Pickler think will win on the show's season finale tonight? "David!" she jokes, but won't clarify if she means David Archuleta or David Cook. That's because, she says, the fan-voted talent show is always unpredictable.

"Nobody is safe," Pickler tells the Associated Press. "The ball's in anyone's court, and you don't know which way it's going to go.''

Take, for example, Chris Daughtry's elimination when Pickler was on the show. She says that was a shocker for everyone -- contestants, judges and fans alike.

Pickler's buddy Carrie Underwood, the most successful 'Idol' winner to date, is scheduled to appear on tonight's finale. She'll perform her new single, 'Last Name,' on the show.

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Kellie Pickler Pictures