Crystal Light is making a sweet breakthrough in fitness beverages with Crystal Light Pure Fitness. The first naturally sweetened, low-calorie fitness drink mix, Crystal Light Pure Fitness contains electrolytes to help aid hydration during light physical activity when you consume one packet. Since women who drink Crystal Light drink 20 percent more water, it helps ensure you get the benefits of water. What's the best part about Crystal Light Pure Fitness? Here are our favorites!

Just because you're a Sugar girl doesn't mean your drink needs to be packed with it. Crystal Light Pure Fitness contains no artificial sweeteners, flavors, or preservatives.

Crystal Light Pure Fitness won’t ruin your diet like other sugary beverages. With only 15 calories per serving, you can stay hydrated and on track!

It keeps your taste buds happy with three light, refreshing flavors: Grape, Strawberry Kiwi, and Lemon Lime.  

So stay cool and hydrated this Summer with Crystal Light Pure Fitness!

Michelle Trachtenberg and Rumer Willis (in Alice + Olivia) wore two very different looks — but looked stellar together — at an event in NYC.

Rumer Willis stunned with her Alice and Olivia dress at the "Darker Side of Green" debate series. There she joined fellow CW star Michelle Trachtenberg and both looked gorgeous. While Michelle showed her wild side wearing a leopard print, Rumer was slightly more subdued with her black-and-white color scheme and minimal accessories. If you're digging Rumer's look, shop it now.

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We're thrilled to present our favorite InStyle story here on Fab!

Oscar-nominated actress Naomi Watts is taking on a brand new role: model. She’s been tapped to be the face of Ann Taylor’s fall campaign. Following in the footsteps of previous ad stars Milla Jovovich and Heidi Klum, Naomi posed for legendary fashion photographer Peter Lindbergh in the collection, which a release noted “was inspired by Ernest Hemingway’s A Moveable Feast and focuses on mixing European sophistication with timeless American style.” Fall 2010 marks the one-year anniversary of head designer Lisa Axelson—who’s done some amazing things for the brand—and the new collection includes plenty of chic staples, including little black dresses, statement jewels, leopard print, and luxe coats. Watts is certainly perfect for the part—in our opinion, the cool blonde epitomizes classic style, as you can see in this exclusive behind-the-scenes shot. For more on Ann Taylor and the fall line, visit the brand on Facebook, and make sure to flip through the AT Insider tab, which features quizzes, videos, and exclusive deals. Check out our exclusive behind-the-scenes shot.

— Rachel Jacoby

For more fashion, beauty, and style buzz you need to know, read What's Right Now! at InStyle.com.

Michelle Trachtenberg was fun and flirty in her leopard-print tee, which she wore to the "Darker Side of Green" debate series. The top was definitely the star of the outfit, but also fun were her slim cargos, studded bracelet, and vintage Chanel necklace — actually available from Shopbop. Snag her Chanel — before it's gone — and all the rest, here.

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Red is definitely on my mind, especially after seeing Rachel Bilson — snatch her look now — and Kate Bosworth working the hot hue at the Vanessa Bruno party in LA. It's simultaneously sexy, slick, and packs enough punch to carry you over from Summer to Fall. That said, I'm challenging you to put together a ravishing red 'fit. Think spunky, not sleazy . . .

There are no rules, no price limit, only utter creativity. Remember to create your spread in ShopStyle then post it in the Fab Stylist group — here are detailed instructions.

To no one's surprise, Gossip Girl's rebel child, Taylor Momsen, was revealed as the face of Madonna's Material Girl collection, bowing Aug. 3 at Macy's. So just how was she chosen by Madonna to be the face of the brand? "I was ecstatic to be asked. It's such an honor. It's Madonna. I was kind of shocked. She's amazing. The role entails doing the launch of the line on Aug. 3 at Herald Square. And I'll be tweeting and talking about the line. We did a photo shoot for the first pieces of the collection. It's a really great line. It's really cool," said Momsen.

Taylor on being a fan of Madonna's music and fashion.

All her songs are so great. They’re so well crafted and really perfect, pure, pop genius. I'm a big fan of "Papa Don't Preach." I love that song. But really all of it is fantastic. She was the one who did it all first. She gave people like me an avenue to do what I'm doing. She was the one who started all the controversy to begin with. I'm a big fan of all kinds of vintage looks and altering them and making them modern. I don't know if I copy anything directly, but I like to mix and match and play around a lot.

Read more about Taylor on Madonna, music, and personal style.

Anna Kendrick was a red carpet hit at the LA premiere of Scott Pilgrim vs. the World in a stunning Marchesa frock and contrasting yellow sandals.