Sears, Roebuck and Co (NYSE: S - news) and Levi's® unveiled today a general market and Hispanic integrated marketing campaign surrounding their joint sponsorship of pop star Christina Aguilera. Sears and Levi's, the presenting sponsors of the Grammy winner's summer U.S. tour - Sears and Levi's Present Christina Aguilera In Concert - will activate the campaign August through mid-October, focusing on national back-to-school in-store promotions taking place August.