Pop superstar Cher was left "upset" over the weekend (25-26May13) when her Twitter.com page was hacked. The singer fell victim to Internet fraudsters who accessed her account on the social networking website and posted a message about a diet brand. Cher was alerted to the security breach by her followers and revealed she was baffled by the hack. In a post on the website, she writes, "You guys I'm really upset about this hacking thing! What diet are you all talking about?!?!" The Believe hitmaker is among a number of stars who have been targeted in a similar scam - Alec Baldwin, Miranda Kerr and Donald Trump have all had their Twitter pages compromised in recent months.