President Reagan will revisit the University of Notre Dame in South Bend, Ind., March 9 to mark the issuance of a postage stamp commemorating Knute Rockne. Rockne, who died in a plane crash in 1931, was, of course, Notre Dame's legendary football coach.

Reagan was last at Notre Dame back in 1981 to deliver the commencement address and receive an honorary degree. That time he shared the platform with the late actor Pat O'Brien, who played the title role in the 1940 tear-jerker "Knute Rockne, All American." Reagan himself starred in that film; he played the role of the doomed star halfback George Gipp. Muzak's Super Hit

And in case anyone out there should need any more reminders about tomorrow's Big Game: Al Smith's D.C.-based Muzak, which has some 5,000 subscribers in the metropolitan area, has since Thursday noon been piping in both instrumental and vocal versions of "Hail to the Redskins" every hour on the hour, 24 hours a day -- and will do so until kickoff tomorrow. Smith says that means that between 75,000 and 100,000 people are hearing the song at any given hour in restaurants, businesses, shopping malls and department stores. Hold the elevator! The Kienast Quints' Birthday Wish

They became only the second set of quintuplets born in America to survive. And next year, if financial aid and scholarships come through, Amy, Abby, Sara, Ted and Gordon Kienast will be away at different colleges, like their older siblings, Meg, 21, and John, 19. The Kienast quints turn 18 next month, and they have a joint birthday wish: to share their birthday privately. The quints were born in New York on Feb. 24, 1970, after their mother, Peggy Jo Kienast, was given fertility drugs. They make news with each birthday and are tired of being in the spotlight, says Abby. However, the publicity is "hard to turn down ... it's not good PR to say no." Grandma's Royal Surprise

Susan Barrantes is going to become a grandmother for the third time next summer. The mother of the former Sarah Ferguson (a k a the Duchess of York) took the news pretty well. "I'm thrilled, enchanted, of course. All mothers are happy when they learn their daughter has become pregnant." (Barrantes has two grandchildren from another daughter, Jane). Her second husband, Hector Barrantes, is a wealthy Argentine businessman who raises polo horses and is active in the international polo circuit. Cicciolina's 'Confessions'

Cicciolina, the porn star and Radical Party member of the Italian Parliament, celebrated the French publication of her autobiography at a Paris nightclub Thursday night. The 155-page book, called "Confessions," sounds as daring as its author, whose real name is Ilona Staller but who is better known by her stage name, which means "Little Fleshy One." In it, she recalls working briefly for the Hungarian secret police as a Mata Hari, using sex to try to elicit secrets from a visiting American politician. The affair lasted just a few days and reportedly culminated in the man's suicide. "That night I cried with anger and shame," she writes. She says she did not know his real name. At Thursday night's party, Cicciolina carried her trademark stuffed bear and a banana onstage for a 12-minute show before hundreds. Mitchelson's Gem of a 'Tiff'

The Swiss branch of Sotheby's auction house is suing palimony lawyer extraordinaire Marvin Mitchelson for $1.1 million, claiming that he has not paid for Cartier jewelry that once belonged to the Duchess of Windsor. The items in question are a bib necklace made of gold, turquoise, amethyst and diamonds, which he gave to his wife, and a sapphire and diamond pendant, which he gave to an unnamed client. According to Sotheby's, Mitchelson bought the jewelry in Geneva last April for 1.4 million francs (about $1.1 million in U.S. currency). Mitchelson insists the dispute centers on his desire to pay in U.S. dollars. "It would save me a couple hundred thousand dollars," he said. "It's just a little tiff. I'm certain we'll work it out."