media_removed_toofab 2013
Kim Kardashian just got out-bootied by her own sister ... but is the butt the real deal?

Khloe Kardashian shared a photo similar to the ones above on Instagram last night, showing off both the reality TV star and her famous sister's curvaceous profiles. The pics were taken at the NBC Upfronts on Thursday in NYC, where the two both donned sexy LBDs.

Almost instantly, tweets about butt injections and pads started spreading like wildfire, getting so bad that Khloe took to Twitter to defend her derriere.

She then urged fans to "look back at it kids" -- which, if you do, proves she's had that behind for quite some time now.

Just check out this photo from 2010:

Yeah, we really got to the bottom of that one.

Khloe has been hitting the gym like crazy lately though, getting worked out by celebrity trainer Gunnar Peterson on a regular basis. According to Peterson, Khloe's routine usually includes plyometric pushups, the sled, dead lifts, resistance bands and ab workouts.

She's definitely been looking pretty hot lately -- check out more sexy Karadashian pics above! 

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