Mary Kate-Olsen & Ashley

Mary Kate-Olsen has unveiled a dramatic new look - she is now a platinum blonde.

The 18-year-old is a huge fan of fashion and regularly likes to experiment with her image.

Her colourist, Lorri Goddard-Clark, tells American publication Us Weekly, "She just wanted a change. She's very playful."

"It's a 1960s bohemian blonde, and she's very bohemian in style!"

Meanwhile, Olsen's twin sister, Ashley, who normally has the lighter coloured hair, has switched to a deep brown hue.

Goddard-Clark, who also colours Ashley's hair, adds, "It's really rich and brings out her amazing blue eyes."