When he wore the green-and-white jersey of the New York Jets, Joe Namath, 40, was known as Broadway Joe for his love of swinging night life. Now he is back on the Great White Way in a different uniform, that of a U.S. Navy officer. Namath is making his Broadway debut in a revival of Herman Wouk's crackling 1954 drama, The Caine Mutiny Court-Martial. The boudoir eyes and patent leer that marred the actor's film (C.C. and Company) and TV performances were refreshingly absent last week as he took over the role of Lieut. Maryk, a well-intentioned innocent who assumes command of a wartime minesweeper from the unbalanced Lieut. Commander Queeg. Clearly awed to be in the company of such all-pro actors as Michael Moriarty, 42, who plays Defense Attorney Barney Greenwald, and Philip Bosco (Queeg), 53, Namath calls the role "my greatest thrill so far in show business." Broadway Joe has only one minor problem: the military haircut ordered by the director. Says Namath: "At least it doesn't take long to dry it."

Body Builder Lisa Lyon, 30, is too busy these days to pump much iron. The U.C.L.A. anthropology graduate, who can dead-lift 225 lbs., has written and appeared in two pictorial bestsellers (Lady; Lisa Lyon's Body Magic) that feature muscle-bulging poses she calls "body sculpture." Now she has left her duties as hostess of a Playboy Network talk show to develop a fashion-modeling career. The 5-ft. 3½-in., 105-lb. unscrawny mannequin currently appears on six pages of the German edition of Vogue; her physique may soon grace rag-trade magazines in Italy and Japan. Lyon will appear before the fashion crowd in person next month, she says, when she models the Liza Bruce ready-to-wear collection in London. Adds she: "I see myself as a representative of a new life, a fusion of mind and body." Press on, Lisa.

"I've got my earplugs in my bag. Do you think I'm going to need them?" asked Diana, Princess of Wales, 22, as she and Prince Charles arrived at London's Royal Albert Hall for a gala charity rock concert featuring, among others, Drummer Charlie Watts of the ever scruffy Rolling Stones, along with Singer Steve Winwood and Guitarist Eric Clapton. Not to listen to Satisfaction, perhaps, but the svelte, silver-clad Di might have wanted to use the stoppers elsewhere. For weeks, curious Britons have been chattering about whether the Princess is pregnant again. London's tabloid Daily Mirror reported that the Princess had announced her happy condition at a family dinner in Balmoral Castle. But Buckingham Palace has maintained a proper silence about what the Princess quite reasonably says is "a private matter." When she visited a school for mentally handicapped children last week, Di was handed a bouquet by 13-year-old Student Fiona Pasmore, who shyly reached out, patted the royal tummy and reportedly asked, "How's your baby, then?" Said the surprised Princess: "Did I hear right?" She did, but once again avoided answering the question.