MTV.com News — From Rihanna to Miley Cyrus, a celeb hair transformation means a lot more than a haircut. By Sidney Madden more info

MTV.co.uk News — Star is no longer a 'Dark Horse' as she shows off her new bright locks on Instagram... more info

MTV.com News — 'Dark Horse' singer debuts bold new 'do just in time for Spring. By Emily Blake more info

MTV.co.uk News — Singer tweets the cover of her upcoming single to fans. more info

MTV.com News — Could it get any sassier? By Emilee Lindner more info

ContactMusic — Katy Perry is having hypnotherapy to get over John Mayer.The 'Roar' hitmaker was devastated when her two-year romance to the singer ended in February... more info

Stereogum — Now on his third in a series of articles examining the brilliant music theory behind ubiquitous pop hits, Owen Pallett might just have a brilliant recurring column in the works. Alas, Pallett says this latest installment will be his last. Beginning w... more info

ContactMusic — Katy Perry is planning to become an art collector.The 'Teenage Dream' singer has decided to add another string to her bow by investing in fine art... more info

ContactMusic — Katy Perry and Pharrell Williams were among the stars who helped raise $2.4 Million (£1.5 million) at the Museum of Contemporary Art's 35th... more info

ContactMusic — Katy Perry wants ''slime green'' coloured hair.The 'Roar' singer - who is known for her jet black locks, but has also dyed it pink, electric blue,... more info