Poorly spelt and offensive messages about her sex life littered her Twitter site.

Twitter is a service which people can sign up for free to update others about their activities to the moment. Other people can subscribe to your Twitter feed to be informed about what you are doing.

This is the latest online hacking incident involving the daughter of American country music singer Billy Ray Cyrus.

Last year, someone broke into her e-mail account and posted candid pictures of her on the Internet.

Senior technology consultant at security firm Sophos Graham Cluley commented: 'It appears that Miley didn't learn the lesson last year and hasn't been taking enough care over her password security.

Cybercriminals were always hot on the heels of new internet trends, and with 'tweeting' so hot lately, it was no surprise hackers had realised its potential, he said.

Singer Britney Spears and United States president Barack Obama also had their Twitter accounts hacked into in January.

This was a result of Twitter's own technical system being compromised by cybercriminals.

Mr Cluley advised other users to choose strong passwords that are not easily cracked so they can 'avoid the same fate'.