She's spent the last few years as an outspoken advocate for marijuana.

In addition to wearing costumes printed with the potent plant's leaves, she has songs about 'smoking pot' and even pulled out a blunt on stage at the European Video Music Awards in 2013.

According to Daily Mail, Miley Cyrus is coming clean about staying sober 'for a second' in the new issue of Billboard Magazine, where she also opens up for the first time about getting back together with ex-fiance Liam Hemsworth.

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'This is crazy, but I haven't smoked weed in three weeks,' she told Billboard in the interview that took place in April, 'which is the longest I've ever (gone without it).'

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'I like to surround myself with people that make me want to get better, more evolved, open. And I was noticing, it's not the people that are stoned,' she said of the decision, adding she isn't drinking either, 'I'm completely clean right now!'

Miley, who has been on a 'media blackout' has finally opened up about the rekindling of her romance with Hemsworth.

Of the on-again relationship, she says, 'I needed to change so much. And changing with someone else not changing like that is too hard.'

Their relationship began on the set of their 2010 movie The Last Song when Miley was still known as a teen pop singer with long brunette hair.

Miley Cyrus and Liam Hemsworth attends the The Last Song premiere in 2010. Photo / Getty
Miley Cyrus and Liam Hemsworth attends the The Last Song premiere in 2010. Photo / Getty

During the course of their relationship, she began to revamp her Disney image for that of a raunchy, pot-smoking provocateur who infamously twerked on Robin Thicke at the 2013 Video Music Awards.

The image overhaul was said to have taken it's toll on her relationship with Liam, and they called off their engagement in 2013.

Miley Cyrus and Robin Thicke perform onstage during the 2013 MTV Video Music Awards. Photo / Getty
Miley Cyrus and Robin Thicke perform onstage during the 2013 MTV Video Music Awards. Photo / Getty

In April of 2016, they were caught together at vegan restaurant Gracias Madre and have been back on ever since.

'We had to re-fall for each other,' Miley explains to Billboard.