It was previously reported that the 18-year-old had led co-star Osbourne astray on the set of So Undercover.
But Kelly took to Twitter to set the record straight.
She wrote: 'Actually it's the other way around Miley has us all on a health kick. Gym/early nights (sic).
'Miley is one of the most hard working respectful women I have ever worked with I am learning a lot from her... Miley and I have become really close I'm sick of all the haters judging her she made one mistake and trust me she has learned her lesson!'