This week, bright rainbow hair colours have been everywhere, from celebrity land to the catwalk. Yesterday, on the Paris catwalks Manish Arora sent out technicolour hairstyles in blue, piercing red and yellow. On the same day in London, the Sugarbabes' Amelle Berrabah appeared with blue streaks in her hair, whilst Kelly Osbourne has dyed her hair lavender. Lady Gaga has gone one step further though, turning her hair sunshine yellow and candy pink. Perhaps its the excitement at Spring, who knows! What do you think? Would you dye your hair a crazy colour for fun?Click through my slideshow to see more pictures of this trend.