Their research on clean beauty products is essentially Gerstein’s bible.

But, when working on her clients' eyelashes, she looks no further than this Parisian staple.

“[It is better for] volumizing, but it lengthens as well.”

leighton meester red lipstick

Gerstein also suggests opting for a deep brown shade instead of the classic black in order toavoid raccoon eyes.

Or, if you’re feeling quirky, try burgundy or navy.

We couldn’t agree more!

leighton meester serious posing