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Musically, this doesn`t rank with the discovery of a 10th Beethoven symphony, but Rob Pilatus and Fab Morvan, the Grammy-stripped lip-synchers better known as Milli Vanilli, will mouth words again. The two will star in a commercial for Care Free sugarless gum in which they will be seen singing an Italian opera. A voice-over asks how long the gum`s flavor lasts. The answer: ”Till these guys sing for themselves.”

NEW KIND OF SKIN GAMES The ancient Greeks did it, so why not 1,000 well-conditioned contestants in a Baltimore suburb? Beginning Thursday, gold, silver and bronze medals will be all the contestants will wear as they compete in the four-day Nude Olym-picks at a campground in Darlington, Md. ”The original Greek Olympic athletes understood the free feeling of nude competition for over 1,600 years,” said organizer Michael Genser of New Jersey. ”We want to provide a chance for anyone to share that great experience themselves.” Events include track, swimming, tennis and volleyball, but no gymnastics or equestrian events.

MERRICK ARRAIGNED Broadway producer David Merrick was arraigned in a New York court Monday on charges he was carrying too much unreported cash as he boarded a flight last week to London. The 78-year-old producer of such hits as ”Hello Dolly” and ”42nd Street” said nothing during the brief proceeding. He was accompanied by Natalie Ting Teresa, his 37-year-old girlfriend who was with him at Kennedy International Airport last week. ”He`s (Merrick) a man of stature and nobody likes to be in the humiliating position of being arrested,” said defense lawyer Lawrence Pollack. Merrick was arrested, police said, for carrying more than $140,000 in undeclared cash and traveler`s checks. Americans may take as much money as they wish out of the U.S., but amounts over $10,000 must be declared on forms, says the U.S. Customs Service.

ROYAL DOINGS Queen Elizabeth II installed King Baudoin of Belgium as a knight of the garter Monday in a ceremony at Windsor Castle. After a lunch using gold plates, the knights of the oldest English order of Christian chivalry joined the queen in the annual procession to the installation service at St. George`s Chapel.

MORE ROYAL DOINGS Crown Prince Naruhito, heir to the Japanese throne, is single, and the Shukan Bunshun magazine thinks the problem may be his highness` hair. ”We urge you to change your hairstyle, Crown Prince,” said the magazine as it depicted him in a variety of new dos, including a Beatles-style mop and a wavy, moussed look. The palace was not amused. The Imperial Household Agency, which runs the affairs of Emperor Akihito and his family and is highly sensitive about the royals` image, summoned the magazine`s chief editor for a verbal protest. The magazine said it is ”studying a response.”

WORDS OF WISDOM ”Hollywood thinks of me as a hot tamale with a truckdriver`s mouth,”

said actress and former Oak Park resident Mary Elizabeth Mastrantonio to Vanity Fair magazine. ”I`m torn between loving this business and hating it. Frankly, I don`t trust any of them.” Mastrantonio appears as Maid Marian in

”Robin Hood: Prince of Thieves.”

PLENTY MORE ROOM Meanwhile, actress Farrah Fawcett has adjusted to life in Tinseltown. She bought a $1.69 million three-bedroom ranch house next door to her home in Bel- Air to accommodate an overflow of house guests and household staff, reported The Los Angeles Times. Fawcett and beau Ryan O`Neal live at her longtime home on a 2.8-acre hilltop tract.