After all that speculation about Charles and Diana's marriage falling apart, the royal couple were busy about their traveling duties together yesterday in Berlin, where the prince referred to his wife as "the most glamorous colonel in the British army." That's the most romantic thing the London press has been able to report about the couple in a long time.

Their appearance in Berlin to help celebrate the 750th anniversary of the city marked the first time Charles and Diana have been seen together since Sept. 16, except for brief public appearances in South London and Wales and a one-night reunion at their country home last weekend. Even though they are back on the road, the home-town press remains close at their heels and will be keeping a sharp eye out for any crack in the new togetherness. In calling the princess "the most glamorous colonel," Charles was referring to Diana's honorary title of colonel in chief of the Royal Hampshire Regiment, which has units stationed in West Berlin.

'Iacocca' in the Orient

Ultimate capitalist Lee Iacocca is about to share the secret of his success with the People's Republic of China. His all-time bestselling autobiography "Iacocca: An Autobiography," written with William Novak, is -- according to his publisher Bantam Books -- the first nonreference book written by an American to be published in China in an authorized Mandarin translation. Iacocca has written a special introduction for the Chinese edition and will contribute all his royalties, as will Bantam, to diabetes research in China. The money will be placed in a fund named in memory of Iacocca's first wife, Mary.

Amazingly enough, the automaker's autobiography was on The New York Times' hard-cover best-seller list for more than 80 weeks, 40 in the No. 1 position. There are 3.5 million paperback copies in print, and the book has been a best seller in virtually all its 17 foreign-language editions. In the Chinese introduction, Iacocca writes that his values -- devotion to family, hard work, love of country -- "exist everywhere. And so does the constant fight to make life a little better for the next generation."

Out and About

It was just like the 1950s and 1960s in Las Vegas Thursday night. Singer Frank Sinatra was performing at Bally's Hotel and Casino when his old pals Dean Martin and Sammy Davis Jr. walked out on stage with bouquets of roses for him. The old "Rat Pack" disbanded a long time ago, but for one night three of the charter members were back together. Undoubtedly, there wasn't a dry glass in the house ...

Hospital Report: Dr. Benjamin Spock, the pediatrician whose book "Baby and Child Care" has been the bible of so many parents, is in good condition at New England Medical Center in Boston after a fall. The 84-year-old activist fainted and tumbled onto the marble floor of Boston's Copley Plaza Hotel ...

That Rambo guy sure is tough. Sylvester Stallone had a close call filming "Rambo III" in Israel yesterday when a helicopter that was to buzz him in a scene missed his head by only a few inches. But was Rambo scared? He is reported to have said: "I suppose if it had gotten any lower I could have saved the cost of a haircut" ...

Entertainer Barry Manilow, summing up his regret about not being a father in the recent People magazine: "I don't know if I'll ever have a blond-haired, blue-eyed kid and a white picket fence. Maybe my legacy will be elevator music" ...