Baby got back ... and it's all natural!

Kim Kardashian is fighting back against reports saying she has had recent butt injections or implants, claiming that her famous derriere is the real deal.

"I'm seeing all these nonsense tabloids claiming I have butt implants-injections. Get a life," she posted on Twitter on Wednesday afternoon.

"Using pics of me 15lbs skinnier (before I had my baby) comparing to me now! I still have weight to lose," she continues. "Anyone who has had a baby knows how hard it is to lose weight (especially the last bit of weight) & your body totally changes!"

"Making fun of me pregnant & making fun of me trying to lose weight now shame on you," the reality TV star adds. "I'm not perfect but I will never conform to your skinny standards sorry! Not me. And BTW I've lost a lot so far & I'm proud of that! Don't give young girls a complex!"

Photographers have always paid attention to her famous backside through the years, something she's both courted and taken issue with in the past.

These days though, she's been all about showing off her cleavage. Check out some of her revealing post-baby outfits in the gallery above -- she's been looking goooood!

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