LeAnn Rimes is co-writing and co-producing her upcoming album with R&B star Brian McKnight, reports Launch.com. The new project is her first without her father, Wilbur Rimes, at the helm as producer. With the help of mother Belinda, the singer is suing her dad and his business partner, Lyle Walker, for allegedly mishandling her money and business affairs. McKnight wrote and recorded "Back at One," a pop hit that Mark Wills also recorded and took to No. 2 on the Billboard country singles chart in March.