Jessica Simpson (search) and Nick Lachey (search) will sing "America the Beautiful" as part of a tribute by the National Football League (search) to mark the fourth anniversary of the Sept. 11 terror attacks.

Their performance will be televised by CBS and Fox before the nine regular-season opening games on Sunday, Sept. 11, it was announced Wednesday.

The pop couple will perform at FedEx Field in Landover, Md., where the Washington Redskins will play the Chicago Bears.

Meanwhile, Lachey will provide features as a regular contributor, including onsite appearances, on ESPN's "College GameDay."

"Nick is a huge sports fan and will add a unique perspective to the show," said Norby Williamson, ESPN senior vice president and managing editor. "He will provide wide-ranging, off-the-field features spotlighting the tradition of the game, its fans, athletes and personalities."

The program starts its new season Saturday.