"Growing up in a faming community in Nebraska, your appearance was the furthest topic of conversation," says Marg Helgenberger. Today, fans of the hit CBS drama C.S.I.: Crime Scene Investigation
can't help but notice that Helgenberger's brassy forensic investigator is also, says costar Gary Dourdan, "the sexiest redhead on television." The 43-year-old survivor of a disastrous go at hot-pink streaks last year admits to changing shades on a whim. "I like variety," she says. Less freewheeling when it comes to keeping fit, the 5'6" actress relies on daily yoga, aerobics or weight workouts—"anything to make me sweat." She and actor husband Alan Rosenberg (The Guardian
), whom she met in 1982 on the set of Ryan's Hope
, live in L.A. with son Huey, 11. Rosenberg, 51, admits to "remaining silent" on some of his wife's more hair-raising dye jobs. "But the choices don't come out of a sense of vanity," he explains. "They come out of her sense of fun—that's what gives Marg that sparkle."