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For those of us feeling the burn on our wallets these days, the gym is one of the first things to go. “Times are tough for people, but it’s no reason to stop being fit,” says celebrity trainer David Kirsch, who helps tone up stars like Anne Hathaway, Liv Tyler and Heidi Klum. Kirsch is sharing his star-worthy workout plans and fitness tips on MSN.com, so you can skip the gym and stay in shape. The price? Gratis.

Buy the book! Out July 13th, David Kirsch’s Butt Book features his “favorite exercises and tips for shaping the perfect, perky butt!”

—Amy Barton

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Hats off to No Doubt frontwoman Gwen Stefani getting her bangin’ pre-baby body back! The superstar revealed an amazing set of abs in front of thousands of people at a concert in Canada. So how’d she do it? After giving birth to second son, Zuma 10 months ago, the mother-of-two got busy at the gym four days a week with trainer Mike Heatlie. “I’ve tried yoga and Pilates before, but I just prefer old-school fitness workouts,” Stefani told InStyle. More

 Not only does Matthew Williamson create party dresses for Hollywood’s hottest It girls, he also knows how to throw one heck of a bash. (To celebrate the launch of his line for H&M, he booked music icon Grace Jones to perform on a yacht!) Now the hip Brit—who also serves as the creative director for luxury label Pucci—has designed the perfect party cocktail, a modern take on Rum Punch. More

Having trouble deciding between Lauren Conrad’s buzzy new tome, a best-seller like Stephanie Meyer’s The Host or a classic book like Jane Austen’s Pride and Prejudice? Don’t bother! Keep your beach tote packed with a subscription to Bookswim.com, an online book-borrowing service that functions like NetFlix. The process is stress-free: create a list of picks, they will ship directly to your doorstep, and don’t worry about returns—keep the books as long as you want with no shipping or late fees. More

Attention tweeters! Are you curious about Michelle Obama‘s latest wardrobe picks or Demi Moore‘s new crush? How about Rosario Dawson‘s new message-in-a-bag or Taylor Swift‘s troubling “lake hair”? We’re bringing the all the latest, greatest style buzz to you in 140 characters or less. So, if you haven’t already, join our growing group of 500,000 fans and get instant updates on what’s worth talking about right now at twitter.com. Dress, Narciso Rodriguez, $893; at theoutnet.com.

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Thankfully the term “walking shoes” isn’t on this administration’s agenda. The First Lady stepped out last week to tend to the White House garden and showed us—once and for all—that there are completely cool and practical sneakers out there. Obama’s new $55 Pumas pack the same amount of punch as the ribbon-trimmed Lanvin sneaks she wore a few weeks ago, but at a fraction of the price. More

Yesterday, searches for pictures of Anna Kournikova on InStyle.com spiked. After a little investigation, it’s easy to see why—the gorgeous Russian wore some skimpy swimwear for a story about sunscreen in InStyle Germany’s Summer Beauty issue. On her personal web site, Kournikova reveals that she loves “anything having to do with the ocean and the beach,” stays in shape by playing tennis and soccer, and uses core stability exercises to keep her stomach toned. More

It is with tears in our eyes that we say goodbye to one of our favorite online retailers, eLuxury.com. The site is folding its e-commerce section of the site next week to focus on becoming a luxury lifestyle online magazine. But every cloud has a silver lining, and this one is lined with seriously cheap It bags and ready-to-wear from the likes of Marc Jacobs, Michael Kors and 3.1 Phillip Lim (just to name a few). The accessories are up to 60 percent off, the apparel just hit the half-off mark and the best merch is flying off the site. More