"American Idol" judge Paula Abdul says she is "not sure" if she will be returning to the popular U.S. TV series for another season.

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Newsday said Friday while appearing on CBS' "Late Show with David Letterman," Abdul joked around about her approach to judging a ninth season of the Fox TV competition.

"I never said (I wasn't returning). I just said that I'm not sure," Abdul told Letterman Thursday night.

"It's called, um, 'negotiating,'" she added.

Letterman offered Abdul a bit of advice by detailing a decision he made earlier in his career, which included hosting duties on NBC's "Late Night with David Letterman."

"One time, I tried that, I was coming up to the end of a contract, and I said, 'I don't know, maybe I won't come back,' and they said, 'Fine because we've got another guy ready to go,'" Letterman told Abdul.

The ninth season of "Idol" is not scheduled to begin until 2010.