It seems Hollywood has been struck by colour-wheel as many pop sensations and stars are caught flashing coloured hairdo. Colouring you hair bright seems to be the current 'in' thing as singer Lilly Allen is the latest to join club following Lady Gaga, Katey Perry, Kylie Jenner, and Rihanna. Time and again celebs have come forward with the idea of adapting to some of weirdest choice which later turn onto like 'fire in the forest' trend. Take a look...Lately, Kylie Jenner shocked her family by dying her hair electric blue days before her elder half-sister Kim Kardashian's wedding to Kanye West.Rihanna who has decided to go with her new baby pink hair piece chose to flaunt it at a basketball game where she arrived in with her friend. Recently Lily Allen was caught flaunting her bright red locks as she stepped out in platform sneakers, teaming it with a fishnet tunic top. Singer Katy Perry too had been bitten by the hair colour bug it seems as she was chose to flaunt 'slime green' hairdo at her concerts and other events.