Kim Kardashian big butt boot camp gym boobs cleavage Kim Kardashian big butt boot camp gym boobs cleavage

No one can deny ... Kim Kardashian works hard for that sexy body!

The 31-year-old reality star, sporting mega cleavage, kept her eyes focused on her cell phone as she texted her way into her Hollywood gym.

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Kim Tweeted the above photo and the following, "Early morning skiing in LA with @Gunnar! ;-)"

Keeping up with celebrity trainer Gunnar Peterson! And since Kim is rumored to be hooking up with ex Reggie Bush, we had to ask her about it! See the video below.