Joss has that hippy look, albeit a bit 'put on' and probably urged to do so by marketing, management et al, whereas Janis found that look for herself and borrowed bits of the chicks around the haight-ashbury scene, but Joss Stone doesn't look physically anything like Janis Joplin, dude.
In addition to the celebrity-fashion challenge with Stone, contestants endeavored to outshoot each other in categories ranging from beauty campaigns to nudes.
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