Christina Aguilera sings the national anthem before the NFL football Super Bowl XLV game between the Green Bay Packers and the Pittsburgh Steelers Sunday, Feb. 6, 2011, in Arlington, Texas. (AP Photo/David J. Phillip)
August 11, 2011 1:49:00 PM PDT
LOS ANGELES (AP) - August 11, 2011 --
Christina Aguilera is lending her voice to a Michael Jackson tribute concert planned for October in Wales.