Christopher Kennedy, son of the late Sen. Robert F. Kennedy, will marry law student Sheila Berner today in Winnetka, Ill., a Chicago suburb, according to published reports.

Kennedy, 24, was to marry Miss Berner at Sacred Heart Roman Catholic Church, according to reports in the Chicago Sun-Times and television station WMAQ-TV. A spokesman for the church said he was not free to disclose any details of the wedding, but news reports said various members of the Kennedy family would attend.

They include Sen. Edward Kennedy (D-Mass.); his former wife Joan; Eunice Shriver; Maria Shriver and her husband Arnold Schwarzenegger; former first lady Jacqueline Kennedy Onassis; and her son John F. Kennedy Jr.

Miss Berner, whose age was not available, is the daughter of attorney Robert Lee Berner Jr. and his wife Sheila Marie. Robert Berner, a resident of Winnetka, is a partner in the Chicago law firm of Baker & McKenzie.

Fergie's Camera Contest Fergie, the duchess of York, took her camera out hunting yesterday and begged 30 million Britons to do the same. Prime Minister Margaret Thatcher even promised to participate.

The occasion? An unusual stunt to raise funds for cancer research. The duchess is calling for every Briton with a camera to shoot a picture of "whatever you think captures the spirit of a day in the life of Britain." Prints submitted with donations of at least one pound ($1.60) will be considered for inclusion in a book of 350 of the best pictures, to be published in November.

The project and the book, called "One Day for Life," are the first shots in a campaign that aims to raise at least $120 million for cancer research.

Huston Restless He's still hospitalized, on oxygen and in a wheelchair, but John Huston is restless. The 81-year-old director of such classics as "The Maltese Falcon" and "The African Queen" is back taking an active role in the production of "Mr. North," a film being directed by his son Danny. "Every day when his son comes up, he goes over every detail of the picture," said Ernie Anderson, Huston's press agent.

Huston is executive director of the movie, being filmed in Newport, R.I. He continues to recover from the bronchopneumonia that complicated his ongoing battle with emphysema, a hospital spokeswoman said yesterday. There is no word yet on a release date.

The Shirt Tale Sen. George Mitchell (D-Maine) doesn't have a black eye patch, but he grew up near the Hathaway Co. shirt factory in Waterville, Maine, and he's never worn any other brand his entire adult life.

So naturally he put on his finest white Hathaway before boarding a plane from Washington for a Thursday celebration of the company's 150th anniversary.

On the plane he leafed through a Hathaway brochure and learned "that the best-dressed men do not wear a white shirt before sundown," the senator told the afternoon gathering. "When I got here, I hurried to my sister's house to change. I put on a striped shirt to meet the president of the shirt company, who had on a white shirt," said Mitchell.

Hathaway's President Russell E. Whiteford was contrite. "I'll never again wear a white shirt during the day," he promised.

Then they got down to business, consuming a cake that featured a drawing of the man in the black eye patch, a character in the company's ads.

Eye Openers Show business biggies will gather Sept. 15 at Hollywood's Universal City's Registry Hotel for an afternoon meeting with Pope John Paul II. The pope plans to discuss modern communications -- and the potential for unifying people around the world -- with leaders in the fields of motion pictures, TV, radio and recording, plus other key members of the media. His words are expected to be upbeat and complimentary ...

Actress Susan Dey of "The Partridge Family" and "L.A. Law" fame is up for an Emmy and is expected to serve as a presenter during the Emmy awards ceremony. The 33-year-old actress is currently preparing for a syndicated two-hour AIDS special in which she will interview Surgeon General C. Everett Koop. That interview will take place here in Washington.