(Cover) - EN Star Style - Nicole Richies hair secrets have been revealed by her LA colourist.

Nicole, 29, is regularly changing her tresses, often preferring to style it in sophisticated up-dos for formal events and keeping it more bohemian in the daytime. Celebrity hair guru George Papanikolas has revealed that Nicoles hair is never over-styled with product instead its held with a light spray to achieve Nicoles trademark textured look.

Nicoles hair is very fine, but curly and frizzy, so she cant use anything thats too greasy or stiff as it weighs it down, the colourist told more! magazine. I usually recommend a light, flexible hairspray like Joico Design Collection Flexible Shaping Spray for that roughed up bohemian look.

The colourist has also revealed his top tips for keeping hair extensions looking natural. Nicole has experimented with hair extensions for years in a variety of lengths and colours.

Nicole is always changing her hair colour, so I need to make sure her extensions blend in well. Blending is much easier than trying to match her hair colour to the extensions. I always think its important to use darker hair towards the nape of the neck and lighter hair at the top of the head, to keep the look natural, he added. (C) Cover Media