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Last Updated: Sunday June 13 2010 07:15 GMT

Katy Perry gets the X Factor

Katy Perry

Pop stars Katy Perry, Pixie Lott and Natalie Imbruglia will appear as guest judges on the next series of the X Factor.

They're all stepping in for Dannii Minogue, who is taking time off from the show because she's having a baby.

Geri Halliwell took Dannii's place at the first round of auditions in Glasgow earlier this month.

Dannii will return for the judges' houses stage of the competition later in the year.

Natalie Imbruglia will appear at the Birmingham auditions on 13 and 14 June, but dates for the other judges have not yet been announced.