Kim Kardashian attends Kim Kardashian 'True Reflection' Fragrance Launch Benefiting Dress For Success - Inside at The London West Hollywood on March 22, 2012 Credit: Michael Bezjian/

It's totally true: Looking good really is the best revenge! Kim Kardashian is still dealing with a painful, messy divorce from Kris Humphries, but she's been channeling it all into her work -- and a killer revenge body, she reveals in the new Us Weekly, out now.

In just seven days, the 5-foot-2 reality star, 31, has shed 6 pounds!

"I'm on a mission," Kardashian told Us at the March 22 Dress for Success charity event that doubled as a launch for her True Reflection fragrance in West Hollywood. "I figure, I'm single. Now is the best time to get in shape."

The QuickTrim spokeswoman (who trains with Gunnar Peterson) did it with major devotion, working out two times daily -- early-morning treadmill runs and strength training or Pilates at night. Her workout buddy? Brother Rob!

And her diet has changed, too, with gluten, sugar and dairy cut out for now. "No more sitting at home, eating too much!"

For much more of our cover story on Kim's hellish divorce battle with Humphries, 27 -- "I'm so ready, emotionally, for this to be over," she tells Us -- pick up the new Us Weekly, on stands Friday.