The 21-year-old musician - real name Natassia Gail Zolot - used her official blog to explain the situation and criticise the hackers.
Kreayshawn wrote: "My twitter got hacked today by some anti-hollywood extremists. They sent out wack ass tweets and promoted their odd message of anti-jew stuff and deleted my twitter.
"Oh, and they leaked out private photos of me while I was underage. Real nice guys! Spreading child-prono thats cute (sic). VMA's was insane on top of that. Can I s**t man?"
Kreayshawn - who appears to have since regained control of her account - later tweeted: "I don't even know what to say. This is some bulls**t... People still have had even worse happen but, I feel like theres always some kinda controversy happening and it's f**kin hard!
"I just want to create in peace and Hollywood will not allow it."
The rapper was nominated in the 'Best New Artist' category at Sunday night's MTV Video Music Awards for 'Gucci Gucci', but lost out to Tyler, The Creator's 'Yonkers'.
> Drake: 'New rapper Kreayshawn has the flows'
Watch Kreayshawn's video for 'Gucci Gucci' below (Warning: Explicit content):