Producers have been desperate to sign the former Playboy model for years but she has always been too busy – not least because she hosts her own TV show in Germany.
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Berlin-born Katarina, 45, will replace outspoken Jason Gardiner on the panel as part of a big shake-up of the show which returns in January.
Camp former Pineapple Studios star Louie Spence, 42, replaces another judge, former Spice Girl Emma Bunton.