Miley Cyrus' best friend has been forced to deny claims the 'Hannah Montana' star is dead.

Mandy Jiroux — who creates videos with Cyrus as part of the 'Miley and Mandy Show' on video sharing website YouTube — said the 15-year-old star is fit and healthy, despite footage claiming she had been hit by a drunk driver appearing on the internet.

The video, posted on the 'Miley and Mandy Show' YouTube page, was alleged to be from Jiroux and said: "Hey guys, this is Mandy and I have some very sad news. We're very hurt to tell everyone this, but Miley died this morning after being hit by a drunk driver. Miley told us if anything ever happened to her then we should let her fans know before the public. R.I.P. honey, we will miss you so much."

A furious Cyrus has now posted a written response on her personal MySpace page declaring herself alive and well.

Cyrus wrote: "Someone hacked the 'Miley and Mandy Show' YouTube account and we can't get back into it just yet! Miley is OK!"