Cyrus finishes writing her autobiography

Teen star Miley Cyrus has finished writing her autobiography at the age of 15.

The actress reportedly signed a seven-figure deal with Disney Book Group to pen her life story in April.

At the time, she said in a statement that the book would "motivate mothers and daughters to build lifetimes of memories together". Cyrus said it is now finished but its launch date has still to be finalised.

"I'm not sure when it's going to come out. It's finished but you've got a long process of editing and all that kind of stuff, so it takes a while," she explained.

Cyrus told the BBC that she also wants to return to hit TV show Hannah Montana for a fourth series.

"Hopefully I'm going to go into season four, but we're not sure so right now we're just getting through season three," she said.