R&B star Beyonce Knowles is being sued by clothing firm Abercrombie and Fitch over an upcoming perfume line.

The Single Ladies singer recently signed with the world's largest fragrance company, Coty, to launch a line of perfumes in 2010.

Abercrombie said it was worried the line from Beyonce, who uses the alter ego Sasha Fierce, would infringe on its own Fierce fragrance brand.

But Coty said it had no plans to use the Sasha Fierce name in its branding.