It was officially "Rose Fitzgerald Kennedy Day" yesterday, proclaimed by Massachusetts Gov. Michael Dukakis. Last week was the big celebration of the Kennedy family matriarch's 100th birthday, while yesterday was the official anniversary of her birth and the private celebration in Hyannis Port.

The morning began with a private Mass and a reading of a telegram from the pope, who offered his blessings, greetings and birthday wishes. There was also a joint congressional resolution as well as a proclamation from President Bush. Several family members were expected, including Jacqueline Kennedy Onassis and her son, John Jr., who weren't at last week's party. Rose Kennedy's only surviving son, Sen. Ted Kennedy, gave her 100 pink roses, and a pianist serenaded with some of her favorite Irish songs such as "My Wild Irish Rose."

Out and About

In spite of a timid memo from a New York City Opera official, the three nude virgins in Arnold Schoenberg's opera "Moses und Aron" will be in the production. Marc A. Dorfman, who handles the opera's foundation and government gifts, worried in an internal memo that the undressed characters in Schoenberg's unfinished masterpiece might upset the National Endowment for the Arts and affect future grants in this era of threats about a broad definition of obscenity. But opera officials don't think even Jesse Helms could find a problem here, and the three nude virgins will be onstage when the production debuts Sept. 22 ...

Hospital Report: Marilyn Quayle was recuperating over the weekend in Bethesda Naval Hospital, where she underwent a hysterectomy for very early cervical disease, according to administration sources. Cervical cancer had been detected in a Pap smear, the Associated Press reported. The operation was said not to be an emergency procedure ...

Nelson Mandela can now ride in style. Workers at a Mercedes-Benz plant in East London, South Africa, in a gesture of admiration and self-sacrifice, yesterday presented him with a $90,000 fire-engine-red limousine, hand-finished for him. The air-conditioned limo with sun roof, hand-stitched leather seats and electric windows, wrapped in the black, green and gold African National Congress flags, was the gift of members of the National Union of Metal Workers of South Africa, who paid for the car by working overtime ...

For those who didn't know, Nicolas Cage, the brooding actor from "Peggy Sue Got Married" who also played the brother whom Cher fell in love with in "Moonstruck," decided to break into show business without trading on a famous family name. He selected Cage from a comic book hero -- Luke Cage. It was his uncle, Francis Ford Coppola, however, who directed him in "Peggy Sue" ...

There are some things Gov. Mario Cuomo didn't tell about the vacation attractions of New York. He was holding a press conference last week on a pier on the East River at the signing of new drug-fighting legislation when a blond, topless woman in a speedboat yelled for attention. Then she dropped her bikini bottom, bent over and mooned the gathering as the boat sped away. "In Queens that never would have happened, I guarantee it," Cuomo said. "For 50 years we've been coming to Manhattan for excitement"