Celebrity hairdos and don'ts

Boris Johnson, loveable dolt and mayor of London, sports his trademark mess Photograph: Toby Melville/Reuters

Yes, this photo of Guns N' Roses frontman Axl Rose was taken way back in 2006, but that just proves how bad hair can come back to haunt you ... Photograph: Pierre Andrieu/Getty

Donald Trump has the most wonderful comb-over in all the world Photograph: Scott Wintrow/Getty

'Bon Jovi, Bon Jovi, let down your hair!' Singer JBJ proudly shows off his long, feathered look Photograph: Matthew Stockman/Getty

Wossy's hair has long been the subject of ridicule and, frankly, his curtains are way past their sell-by date Photograph: Rex Features

Cricketer Kevin Pietersen emulates a skunk Photograph: Nils Jorgensen /Rex Features

Russell 'bog brush' Brand Photograph: Dan Steinberg/AP

Mongol conqueror Genghis Khan. Apparently his power was 'inextricably' tied up with his hair Photograph: Corbis