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While most of us will never afford to carry the"Rolls Royce" of purses -- aka the Hermes Birkin -- Khloe Kardashian uses hers as a gym bag!

The Kardashian sis has been busting her buns overtime at the gym lately, and she Tweeted after her grueling workout in LA, on Monday: "Wowazzzzz thank you pilates plus for kicking my a** today."

The reality star has also been helping hubby Lamar Odom get back in NBA shape after he was released from the Dallas Mavericks this year, and she even skipped out on a trip to Paris with Kim and mom Kris to be by her man's side.

Unlike Kim and Kris Humphries, it seems Khloe and Lamar are the real deal.