Miley Cyrus has lashed out at reports suggesting she and her teenage sweetheart Nick Jonas have been meeting up in secret behind her fiance Liam Hemsworth's back.

The former Hannah Montana star has been at the centre of ongoing speculation her romance with the Australian hunk is on the rocks since she was snapped without her engagement ring while Hemsworth was Down Under vacationing with his family.

The actress/singer has repeatedly claimed the relationship is still on, but new tabloid gossip suggests the star has been enjoying secret rendezvous with Jonas, who she dated in 2007.

Now Cyrus has angrily shot down the rumours, insisting she hasn't seen the Jonas Brothers hunk for years and has been trapped in her house due to a constant paparazzi presence.

Taking to to address the claims, she writes, "I literally haven't seen Nick Jonas in years. Don't believe everything you read folks.

"Why are magazines allowed to publish straight bull s**t... I couldn't have 'ran' into anyone because I haven't went (sic) to eat out in public in weeks because of the amount of paparazzi outside my house."