Julia Roberts in her first ad appearance for Lancôme. Courtesy photo.

Lancôme is finally revealing their "Pretty Woman."

In her first product campaign for the luxury French brand, Julia Roberts looks captivating in sunny blonde highlights and her trademark full pout -- and it's a brand new mascara that Roberts is modeling for a doe-eyed look.

The new Définicils Precious Cells Mascara features stem cell technology by way of Swiss apple extract that Lancôme claims will grow lashes longer and lusher while you rock the dramatically volumizing formula.

We've given the new star product a whirl, and are impressed by the ink-black color and both lengthening and thickening action. A brush made up of short bristles interspersed between longer bristles really did get at even our shyest corner lashes.

Just one word of warning: the formula goes on very dark and wet, so wait a few seconds for dry-down before applying any other eye makeup to prevent smudging.

The mascara will retail for $29 and debut in fine department and specialty stores nationwide mid-summer, though you can grab one now exclusively at Nordstrom stores and online at Nordstrom.com.

Who says you have to be a "Pretty Woman" to have all the fun?

And for more lash-lengthening news, check out our round-up of the hottest summer mascara launches.