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Lady Gaga has urged her legions of fans to buy a special bracelet launched to raise funds for those affected by the Japanese tsunami.

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More than 20 countries in the Pacific Rim were put on high alert on Friday after a massive, 8.9-magnitude tremor caused a tidal wave which devastated Japan.

A raft of celebrities have sent their condolences to those who have lost family members in the disaster, and now the "Poker Face" hit maker is asking fans to donate $5 or more to the relief effort by buying a bracelet via her website.

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A post on the site reads, "Lady Gaga designed a 'We Pray For Japan' prayer bracelet, buy yours now for $5 in the web store and all proceeds go to Japan tsunami relief."

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Japanese star Yoko Ono and Star Trek actor George Takei have also asked for fans' help in raising money for the cause.