This Jessica Alba-approved mascara is $17 on Amazon

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You don't always have to turn to extensions in order to have long and defined lashes — a nice foundation and a good mascara can often do the trick, too!

But if you're not sure where to get a great mascara, take a page from Jessica Alba's book: She uses the 2-in-1 Honest Beauty Extreme Length Mascara and Primer. It's a product from her Honest Beauty line, and it's listed under the actress' "faves" on the company's official Amazon store.

Shop: Honest Beauty Extreme Length Mascara + Lash Primer, $16.99

The mascara boasts a pretty unique 2-in-1 feature: It has a primer on one side, and mascara on the other. The primer is used to help prep the lashes, while the mascara is used to lift and lengthen your lashes. Additionally, its small bristle brush is designed to give your lash some serious definition.

But the thing we love the most about Honest Beauty's mascara is that it's dermatologist- and ophthalmologist-tested. And, as a bonus, the mascara doesn't contain parabens, silicones, mineral oil, synthetic fragrances and all that jazz.

With over 1,000 customer ratings and over 500 five-star reviews, it's the No. 4 best-selling mascara on all of Amazon. While many of the reviews raved about its ability to lengthen lashes, some wished the mascara went on a little smoother.

"I bought this mascara because I was having minor allergic reactions to drug store brands," one reviewer wrote. "I really like the formula of this mascara, and I love that it comes with the primer on the other end. The only complaint I would have is that due to the wand, the mascara can sometimes go on a little bit clumpy. To fix this I just brush it out with a brow spooly. 5 stars!"