Cyrus fired off on Twitter Friday, saying he had just seen the images for the first time and "had no idea" the partying had taken place.
"Im so sad," the tweet said. "There is much beyond my control right now."
The New York Daily News said video cropped up a couple of months after the 18-year-old pop princess' parents, Billy Ray and Tish, announced their divorce.
A source told TMZ that despite her giggling and sometimes incoherent conversations, Miley was not smoking marijuana but rather Salvia, an herb that can have hallucinogenic effects.
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