The 29-year-old star, who was spotted wearing a ring on her engagement finger earlier this month, is said to have ended the romance "within the last few days", reported E!Online.
It is so far unclear as to what caused the split as neither of the pair have spoken out about the reports.
Perry, who has been married once before to comedian Russell Brand, first started dating Mayer in 2012, although they split briefly last March before deciding to give their relationship another chance.
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