J.C. Penney Co. and Seventeen this month kick off the "Rock Your Prom Sweepstakes." One grand prize winner will receive a prom package including a live performance by J Records' O-Town, a prom dress from J.C. Penney Co., free tuxedo rental, dinner for two plus limousine transportation and the winner's photo appearing in Primedia's Seventeen. Eight runners-up will receive free prom dresses, and all customers who buy a prom dress from J.C. Penney will get a free crystal tattoo. The sweepstakes is promoted at J.C. Penney stores, in Seventeen's February and March issues, and online (seventeen.com). Contest entry deadline is March 1.