Martie Maguire of the Dixie Chicks and her husband Gareth are expecting a daughter. She revealed the news to People magazine on the red carpet at a benefit for the Nobelity Project in Austin, Texas, on Sunday night (Jan. 27). The couple had twin daughters in April 2004. Other guests at the event, which was a fundraiser for the film One Peace at a Time, included Lance Armstrong, Willie Nelson and Owen Wilson, as well as Nobel Prize winner Steve Weinberg, a professor at the University of Texas.