You always want what you can’t have — especially when it comes to beauty products. That’s why we’re getting the inside scoop from your favorite retailers on what’s selling out right now, how to sign up for waitlists, and where to go to find the next best thing. Because if everyone’s buying it, you know it’s got to be good.When it comes to foundation, we are very, very picky. If we're going to buff the stuff all over our faces, we want the formula to be lightweight while still providing excellent coverage — two traits not often found in many of today's offerings.So when Tarte launched its Rainforest Of The Sea Water Foundation in February, we predicted it would be a winner . Turns out, our prediction was spot-on, because now the foundation is one of the brand's best-selling products at Sephora If you miss your chance to buy it, or perhaps just want to try something new, we've rounded up a few of our favorite foundations in the following slides that are so lightweight, they're basically like second skin. Here's to erasing the term "cake face" from our vocabulary.