Katy Perry (AP/Splash)

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AP/Splash

Katy Perry

Just days after announcing her separation from Russell Brand, Katy Perry was photographed sporting a bright blue bob. And while Katy has changed her hair colour for reasons less complicated than a divorce, we wouldn't blame her for going a little crazy with her hair to deal with the chaos. After all, she'd been wearing it blonde - a fairly demure diversion from her usual colour choices - up until she and Brand decided to call it quits.