When Kelly Rowland exits the U.K. version of "The X Factor," there will be an empty seat to fill. Possible replacements include Katy Perry and Nicole Scherzinger, according to longtime star Louis Walsh.

He told the Irish Herald newspaper, "I've worked with Nicole and Katy before and I would love to work with them again, they were fantastic."

There are five celebrities being considered to fill former Destiny Child star Rowland's seat. Current "X Factor" Australia judge and former Spice Girls star Melanie Brown, Anastacia and ex-judge Sharon Osbourne are also in the running.

Walsh added, "...

Simon Cowell is considering axing his U.K TV hit The X Factor if ratings continue to fall.

The music mogul abandoned the British version of the show to take the concept Stateside, leaving the panel in the hands of Take That star Gary Barlow, who was joined by fellow panelists Kelly Rowland, Tulisa Contostavlos and Louis Walsh.

However, the new line-up failed to achieve the huge rating figures Cowell was used to and he admits he may scrap the series and replace it with another project.

He tells Live magazine, "I would rather (the show) fall off the cliff on numbers than deteriorate slo...