NEW CHAPTER: After years of seclusion, Jil Sander may finally be ready to open up. The designer, who left her namesake company three years ago, is planning to pen a book about her life and career, according to a source. "She's been approached about so many things and turned down so many projects, but not this time," said the source.

DOING IT ALL: Rihanna is out to become one of the budding multihyphenate pop stars. The 19-year-old — who walked the runway at Thursday's Dsquared show — said she's keen to launch her own clothing collection. "Something edgy," she said before the show, although she said she isn't in talks with anyone yet. Rihanna is also eager to pursue other creative outlets, including a possible foray into film. "Something that allows me to keep entertaining," she added. The Barbados-born beauty, on tour in Canada, flew in on her day off, spent one night in Milan, walked the runway, helped inaugurate Dsquared's first store then flew back to Toronto the same day to perform in concert. "It's a short little trip, but it's better than nothing," she said. And what about all those rumors about her sizzling love life? "It's all not true. I'm not dating anyone. I'm single," she said. Then the twins piped in: "She's dating Dsquared."

POINT AND SHOOT: In a low-key celebrity season in Milan, Marisa Tomei and Winona Ryder sent the paparazzi into a frenzy at the Alberta Ferretti show Wednesday night. Tomei, who hails from the south of Italy, was off for a family trip to Sicily. "It'll be the 12 of us, the Bianchis and the Tomeis, for two weeks all together — I don't know how we are going to survive," joked the actress, who was taking a break from stage rehearsals of "O The Humanity" in New York. Ryder managed to do a little sightseeing in Milan before the show. "I was so tired, but I made myself walk," she said later at a dinner hosted by Ferretti. In particular, Ryder was awestruck by the Duomo, the city's imposing cathedral. "I just had to take photos of it, even if it was only with my portable phone," she said.

ENTOURAGE: Naomi Campbell put in an appearance at Dolce & Gabbana this season, but not on the runway. She watched from the front row and, true to form, had her beefy bodyguards plow through the crowd to whisk her backstage afterward. Meanwhile, a newly strawberry blonde Rose McGowan, also at the show, feared legal retribution for revealing too much about what she is working on. "I can't or I'll get sued!" she cried. Fanny Ardant and Caterina Murino rounded out the celebrity section.

A SWANKY AFFAIR: As it counts down the days to its big 100th birthday bash on Oct. 12, Neiman Marcus has already received one glittering RSVP. Actress Hilary Swank is expected at a party being held that night at Neiman's downtown Dallas store.

CHINA OR BUST: Given that there were no celebrities at Fendi on Thursday, could Karl Lagerfeld be saving the stars for the reprisal of the spring-summer show next month on the Great Wall of China? Rumor has it Sharon Stone is trying to free up her schedule to make it to the landmark fashion event. Among others expected are LVMH Moët Hennessy Louis Vuitton chief Bernard Arnault, artist Terence Koh and a host of international editors.