US pop star Miley Cyrus has revealed the personal and professional toll she suffered in the wake of leaving behind her image as a wholesome child star.

Key points: Hemsworth filed for divorce on Wednesday after marrying Cyrus just seven months ago

Hemsworth filed for divorce on Wednesday after marrying Cyrus just seven months ago Cyrus wrote on social media that she will always love the Australian actor

Cyrus wrote on social media that she will always love the Australian actor She said she was "not perfect", but rejected claims the marriage ended due to infidelity

Posting a series of tweets in response to speculation about her pending divorce from the Australian actor, Cyrus wrote: "You can say I am a twerking, pot smoking, foul-mouthed hillbilly but I am not a liar".

Hemsworth, 29, and Cyrus, 26, had been in an on-again, off-again relationship for 10 years, but married just seven months ago.

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The Wrecking Ball and We Can't Stop singer, who rose to fame as a tween pop sensation as the eponymous star of the Disney television show Hannah Montana, also revealed that her use of marijuana had cost her a lucrative endorsement deal as a teenager.

"It is no secret that I was into partying in my teens and early 20's. I have not only smoked, but advocated for weed, I've experimented with drugs," she posted.

"I lost a massive Walmart deal at 17 for ripping a bong," she said in another tweet, claiming later in the thread that she lost a role in the Hotel Transylvania film series after buying Hemsworth a birthday cake in the shape of a penis.

"I swung on a wrecking ball naked. There are probably more nudes of me on the internet than maybe any woman in history.

"I've learned from every experience in my life. I'm not perfect, I don't want to be, it's boring. I've grown up in front of you, but the bottom line is, I HAVE GROWN UP."

Hemsworth, a star of Independence Day and the Hunger Games films, filed for divorce on Wednesday, citing irreconcilable differences.

Cyrus and Kaitlynn Carter, the estranged partner of Brody Jenner, were seen kissing in photos that surfaced earlier this month.

Cyrus didn't mention Carter by name on Twitter, but admitted to cheating in relationships when she was younger.

"There are NO secrets to uncover here," Cyrus tweeted.

Cyrus and Hemsworth first met while making the 2010 film The Last Song and were engaged in 2012.

They broke up in 2013 but got back together again in 2015 and were again engaged a year later.

The pair tied the knot at their Tennessee home last year. ( Instagram: conradjackcarr )

Cyrus, who starred in the Black Mirror television series this year, said she was faithful once she and Hemsworth reconciled.

"Liam and I have been together for a decade. I've said it before and it remains true, I love Liam and always will.

AP/ABC