Kim Kardashian's stay-slim secrets

When you're known for little else than being Paris Hilton's former sidekick, you've got to distinguish yourself from the socialite somehow, right? Kim Kardashian has done that a few ways -- with a sex tape, a reality show and now a nude spread in Playboy.

How did she buff up for the shoot? The Fit List recently revealed her workout secrets. Kim looked pretty good before -- she walks lots and uses her Elliptical trainer every day -- but in addition, she toned up with these exercises:

• Lunges
• Sit-down squats
• Arm and leg opposition
• Push-ups
• Tricep dips

Yep, if you do enough of those, they'll get you toned up enough for a nude shoot.