With experience in modelling and make-up artistry the sisters started creating their own cosmetics in San Francisco in the late 1970s before expanding gradually to become the ingenious and bestselling Benefit we all know and love today.

They are full of energy and creativity and have tons of experience, so whether you want beauty tips, career advice or just want them to share some nostalgic insights from their time in the business be sure to send us your questions by Friday morning.

Get in contact with us via Twitter @ELLEUK or pop your questions in the comment box below.