P. Diddy, Jack Black and Ben Stiller dye their pubic hair, it has been claimed.

The trio all reportedly use Betty Beauty dye to transform the colour of their nether regions.

Rapper P. Diddy was so impressed with the product he asked his assistant to send back a thank you note when he was sent a complementary sample of it.

Betty Beauty boss Nancy Jarecki told the New York Post newspaper: “We've sold 160,000 units to date, and business keeps growing. There doesn't seem to be much of a stigma attached to it.

“I guess man-scaping for guys is really big these days.”

Nancy claims the product would be the perfect Christmas gift and so has manufactured a special “holiday package” for those looking to give something a little different over the festive period.

She said: “We've got some Christmas tree, angel and star stencils that we're packaging with our green and red dyes. The most popular colour is hot pink, people really seem to have fun with that one.”