The federal class action lawsuit against Gaga claims that she profited from the sale of her 'We Pray For Japan' wristbands, whose sale Gaga announced within hours of the devastating earthquake and tsunami on March 11 through her official website for 5 U.S. dollars.

　　The lawsuit was filed in Michigan on Friday by Michigan legal network 1800LAWFIRM while the "Born This Way" singer was in Japan for a benefit concert for victims of the March earthquake and tsunami, according to Reuters.

　　"While we commend Lady Gaga for her philanthropic efforts, we want to ensure that claims that 'all proceeds will be donated to Japan's earthquake' are in fact true," said Alyson Oliver, an attorney for 1800LAWFIRM.

　　"Our intention via this lawsuit is to uncover any improprieties committed by Lady Gaga and appropriate the full donations assumed to the victims in Japan."

　　Gaga is reported to have donated about 3 million dollars to Japan disaster relief through sales of the wristbands and other ventures.

　　Neither Lady Gaga herself nor her rep gives comment on the lawsuit yet.

　　Lady Gaga was last month named the most powerful celebrity in the world by Forbes magazine, based on her earnings, media visibility and social media popularity.(本文由在线英语听力室整理编辑)