0Nicole Kidman Blonde, Lady Gaga Green and More Celebrity Hair ColorsCoiffuresNicole Kidman switched to yellow, Lady Gaga went green, and Katy Perry sported a blue 'do.Updated Jul. 14, 2017 2:51PM EDT / Published Aug. 06, 2009 7:00AM EDT RedKevin Winter / Getty Images; Pacific Coast News OrangeSylvia Linares, WireImage / Getty Images; Joe Schildhorn / Sipa; Sang Tan / AP Photo YellowFlynet; Fame; Getty Images GreenMarina Bay Sands via Getty Images; Alexander Tamargo / Getty Images BlueNiko, Le Floch / Sipa; Katy Winn / AP Photo IndigoKennell Krista / Sipa VioletAlberto E. Rodriguez / Getty Images; Jim Dyson / Getty Images RainbowAdmedia US / Sipa
RedKevin Winter / Getty Images; Pacific Coast News OrangeSylvia Linares, WireImage / Getty Images; Joe Schildhorn / Sipa; Sang Tan / AP Photo YellowFlynet; Fame; Getty Images GreenMarina Bay Sands via Getty Images; Alexander Tamargo / Getty Images BlueNiko, Le Floch / Sipa; Katy Winn / AP Photo IndigoKennell Krista / Sipa VioletAlberto E. Rodriguez / Getty Images; Jim Dyson / Getty Images RainbowAdmedia US / Sipa