The AP reports Wednesday that Whitney Houston has postponed more concert dates (full article below) at the same time a celebrity weekly features an interview alleging she's doing drugs again. In Touch interviewed someone who says Whitney showed up a club and snorted white powder from a baggie. From the In Touch press release: In Touch can reveal shocking claims from onlookers at the Beverly Wilshire hotel in LA who were surprised on March 10 when the singer walked into the bar, appearing disheveled and out of it.