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Celebrity photos: Geri Halliwell returned to The X Factor as a guest judge as the auditions kicked off this week. The star made a grand entrance, clambering out of her car and sitting on the roof, shouting to fans through a megaphone.

Spotted: Celebs in pics (18-25May)

Take a look back at the best photo-shoots, pap shots and Twitpics of the celebs from the past week. Includes Peter Andre and Cheryl Cole.

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