Watch out, Jessica, Paris and Lindsay: There’s a new object of the paparazzi’s dubious affection. And she’s proving to be a quick study of the red carpet’s perilous twists and turns. Katie Holmes, currently on her whirlwind world tour with new fiance Tom Cruise, is flirting with different looks and different designers, but so far is keeping it simple. No dumpster chic for her — at least not yet. “Katie’s charm comes from her always-bright personality,” says Giorgio Armani, who has dressed the actress often. “She combines a wonderful innocence with a subtle but strong sophistication in the way she dresses.” Holmes’ stylist, Jeanne Yang, has carefully put the starlet in jeans and designer frocks from Chanel, Dior, Prada and Chloe — not to mention Armani — for everything from casual street appearances to black-tie galas. Mission accomplished.