an april sighting in milan or this vogue event last fall, not enough to keep her bereft fans from putting out this wanted poster. ♪ >> reporter: she's had nine lives as a singer actress and performer, michael's little sister a youth on "diff'rent strokes," then bursting into music stardom on her own terms, in 1986 with "control." huge hits like i"nasty." ♪ nasty boys ♪ >> reporter: millions of fans devoted citizens of her rhythm nation. much beloved in the wake of later moments, both controversial and poignant. 2004's bizarre nipple gate incident, comforting a distraught paris jackson at michael's memorial. ♪ now at 49, janet's back once again with co-writer/producers jimmy jam and terry lewis, dropping a new track, "no sleep." yes, three es. on monday. and tweeting "i dedicate this to