Madonna is being sued over her clothing line.

The '4 Minutes' singer - who worked on a range of clothes entitled Material Girl with her 13-year-old daughter Lourdes - is being sued by LA Triumph for using the same name as their clothing collection.

Lawyer Peter Afrasiabi told X17online: "Our client and its predecessor have been continually selling similar clothes in similar retail outlets at similar price points under the Material Girl brand since at least 1997 and Madonna and her new-found company do not have the right to trade in the same space under this brand."

Chris Arledge, an intellectual property lawyer, added: "As a result of their acts, our client faces a risk of being subsumed by Madonna's profile, obvious worldwide notoriety and the massive spending campaign by Madonna, her company and retailers on her behalf."

Last month, Lourdes' father Carlos Leon admitted the teenager was the "creative force" of the clothing range, which is sold as US department store Macy's.

He said: "She's 100 per cent the creative force of Material Girl. She knew exactly what she wanted.

"She's a trendsetter that draws from all different things to put together a look. She's into different cultures and brings that into her style."