The former Hannah Montana star recently told Rolling Stone that she often feels like a mentor to Justin as although she has "already transitioned" in her career, she feels he hasn't.
She said: "People don't take him seriously, but he really can play the drums, he really can play guitar, he really can sing. I just don't want to see him f**k that up, to where people think he's Vanilla Ice. I tell him that. Like, 'You don't want to become a joke'."
Miley, however, has now taken to Twitter to clarify her comment, insisting that she's 100% supportive of Justin and thinks he is a great artist.
She tweeted: "Always have ALWAYS will root for @justinbieber he always has and ALWAYS will be the s**t. #onlylamestwistwords."
And, showing there are no hard feelings, Justin retweeted her tweet to his millions of followers.
He then added to Miley: "It's all good. I know what it is. We keep it interesting."
Miley, 20, is currently on a huge promotional drive ahead of new album Bangerz, which is released in October. It will feature the singles 'We Can't Stop' and 'Wrecking Ball'.
Justin, meanwhile, is on a mammoth tour. His next stop will be Bangkok tomorrow night (26 September) and he'll be on the road right up until December.