Showing off as cover girl for Shape Magazine's June issue, Britney Spears flaunts a taut and toned figure that commands attention and ups the skin-baring ante.

The mother of two dons a sexy ivory Deja Soleli white bikini, with multiple hip-hugging straps and cutouts that accentuates her tight tummy, curves and pierced navel according to E! Online. She is so smoking hot that the cover banner, "Britney at her best! 31, firm and fabulous," speaks volumes.

But what does the singer do to stay fit? She does 90 minutes of yoga twice a week, and hour-long cardio sessions with trainer Tony Martinez three times a week to achieve an amazing physique, she tells Shape. While working out, Spears rocks out to Bruno Mars "Locked Out of Heaven" and Whitney Houston "I Wanna Dance With Somebody," according to ABC News.

Her fine-tuned nutrition regime also helps her to achieve a nice shape. The singer loves Nutrisystem shakes for breakfast and lunch, protein and vegetables for dinner, but it is tricky to avoid fattening indulgences like her two sons' Sean and Jayden's favorites, chocolate chip cookies. "I try not to make those too often, or I will eat the whole bowl of dough," she said. Spaghetti is one of her specialities, but the star maintains and shows off her killer body in the magazine's pages in a high-waisted, black-and-white skirt and charcoal bra top posing adjacent to a punching bag as revealed in US Magazine.

She struggles with sculpting her post-babies body, but has the will power to do it. "I like it, then again, I hate it," she revealed to Shape just two months after cameras caught her in another eye-catching striped bandeau bikini at a friend's house in Malibu. "I'm in my 30's now, so I have to work harder to keep it up."

Turning the clock back to 2009, she told Glamour Magazine that she had to work hard getting back to her "Slave For U" body since her obsession with exercising has now dwindled.

The X Factor judge is also gearing up for her long-rumored-turned-reality Las Vegas residency starting this Fall. After being caught on camera by numerous shutterbugs going to and from the gym, the former teen pop queen proves that hard work pays off and she is ready to conquer the road ahead. "The Vegas performances won't be simple -- they'll be a massive party from start to finish. And to pull this off, I have to be in top condition and running at full speed."

Details of her Sin City's stint at Planet Hollywood including initial concert dates and ticket sales will be revealed in 20 days, according to USA Today.

To check out Spears' Shape cover, click HERE.