It was reported that the 19-year-old had gone under the knife and had a breast enlargement after she recently stepped out at the 2011 CNN Heroes: An All Star Tribute in Los Angeles, wearing a very low-cut yellow dress which showed off her impressive cleavage.
However, Miley has been quick to deny the allegations, setting the record straight on her Twitter page.
Speaking about her boobs, the former Hannah Montana star said: 'Thank you for the compliment but these babies are all mine. I wish they'd realise you don't have to be fake to be beautiful!'