Lady Gaga has described a lawsuit which claims she is misleading her fans by seeking donations for victims of the Japanese earthquake as "misguided" and "without merit".
The pop star's website is selling five dollar (£3.13) wristbands which say "We Pray For Japan". It also allows people to make additional donations and says "all proceeds go directly to Japan relief efforts".
But a lawsuit filed in Detroit notes that sales tax and a 3.99 US dollar (£2.49) shipping charge are added.
A lawyer based in the area, Alyson Oliver, reportedly believes that not all money is going to help the Japanese and has sought more figures.
The lawsuit filed on Friday in a federal court in Detroit seeks class-action status and possible refunds for people who bought wristbands.
A spokesman for Lady Gaga said: "This misguided lawsuit is without merit and unfortunately takes attention away from the kind deeds of the fans around the world who are supporting the people of Japan.
"The entire five dollar donation made with the purchase of each bracelet is going to support the disaster relief. No profit is being made on shipping costs. Sales tax charges were made in accordance with local legal requirements.
"Lady Gaga has personally pledged her own funds to this cause and continues to support the victims of the disaster."