Gwen Stefani is suing a U.S. retail chain claiming designers copied her heart trademarks from her Harajuku and L.A.M.B. clothing lines. The Hollaback Girl singer claims Forever 21 bosses engaged in "acts of trademark infringement". Stefani, through her Harajuku Lovers, LLC company, is seeking to stop Forever 21 from modelling clothes based on her own designs, as well as unspecified monetary damages.