Victoria Beckham, Katy Perry

American Idol may be losing Paula Abdul, but it's gaining Katy Perry and Victoria Beckham as guest judges, Fox announced Thursday.

No dates have been set for the pop stars' appearances, but more big names are to come, Fox entertainment chairman Peter Rice said at Thursday's Television Critics Association fall TV tour. None of the people the show is talking to are potential full-time replacements for Abdul, Rice said.

See photos of Katy Perry

"We don't have deep contingencies laid in. We're going to have these guest judges do one week each during the auditions. We've done that before. We've done that in many, many seasons of Idol where not all of the judges were available to do the auditions and guest judges" have filled in, Rice said.

"There is no contingency, no expectation, no thought right now that any of these judges will be a long-term judge for us," he added. "All of the people we are talking to have successful careers. I don't think they'd be available to judge full-time."

See photos of Victoria Beckham

Might the show replace Abdul with a series of guest judges? "Yes, I would say it is a possibility," he said. "I wouldn't say it's a probability."

Are you excited about Perry and Beckham?