The 67-year-old singer was alerted to the security breach by her followers and revealed she was baffled by the hack, reported Daily Star.
In a post on the website, she posted, "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.
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