NICK CARTER and HOWIE DOROUGH of the BACKSTREET BOYS, LARS ULRICH of METALLICA, EMILY ROBISON of the DIXIE CHICKS, GENE SIMMONS of KISS and MARK McGRATH of SUGAR RAY will all compete in an upcoming pair of "Who Wants to Be a Millionaire" episodes, set to air February 11th and 14th on ABC. All winnings will go to charity, with each star's charity guaranteed at least $32,000.