What are Pete Doherty's kitties on?

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There's nothing wrong with giving your kitty a little hit of catnip now and again. But are Pete Doherty's cats really on crack? Someone please tell me this isn't true...

Photo credit: Kate Moss with her wacked-out musician boyfriend and possible cat inebriator, back in the day. Put down that pipe and step away from the cat, Mr. Doherty!
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