As a model, Margaux Hemingway had graced enough fashion pages to sup port a Boy Scout paper drive; as a businesswoman, she held a $1 million contract from Faberge for plugging perfume. What else could there be?

Movies, of course. Now in Hollywood working on Lipstick, a courtroom drama starring Anne Bancroft, she has been performing by day while taking acting and voice lessons in her off hours. "I can read the script before I go on and memorize my lines after studying them just one or two times," she reports with obvious pleasure. Though she plays a model, she insists that she has not been typecast. "The character I play is to tally different from the way I am," says the flaky Margaux. "A lot more low-keyed. A lot less flamboyant."

"Your hiding place isn't watertight," observes a character in Ingmar Bergman's 1965 film Persona. "Life trickles in from the outside and you are forced to react." Last week the Swedish director found life flooding in on him.

In the midst of his rehearsals for a new stage production, Stockholm police collared the master. Whisked off to the police tax division, Bergman was grilled on suspicion that he had failed to report $119,000 as income from his former Swiss-based company. "What happened is painful and humiliating," protested Bergman, 57, insisting that he had no knowledge of any tax problems: "I leave that up to my lawyer."

Released after more than two hours, he later entered a hospital suffering what friends called "a nervous breakdown." Apparently unmoved, the police filed charges that could bring him a maximum of $595,000 in fines or two years in jail.

It might be called a sister act, except that New York theatergoers will need two tickets and a fast taxi to catch both Lynn and Vanessa Redgrave in action next month. For two weeks the British-born sisters will appear simultaneously on different stages, Lynn as the upright daughter of a veteran hooker in Shaw's Mrs. Warren's Profession, Vanessa as the star of Ibsen's The Lady from the Sea. Might that box office competition strain family relations? "We'll get along fine, as long as we don't talk politics," says Lynn, who describes herself as a "liberal capitalist" while her sister belongs to the Trotskyite Workers' Revolutionary Party.

"It came as a shock. After all, I hadn't been married since the 1940s." Thus did Actress Gloria Swanson, 76, describe her marriage proposal from Writer William Dufty, 60. Married five times (among her husbands: Actor Wallace Beery), she first met Dufty more than a decade ago when he was an assistant editor on the New York Post. "He looked like a Buddha, all blubber," she says. Swanson, a natural-food fanatic, helped prod Dufty off sweets and onto a macrobiotic diet--and last week married him in Manhattan. "He's a convert of mine," boasted Gloria as she prepared for her honeymoon, a three-week tour to promote Dufty's new health-food book, Sugar Blues.

Chocolate cake, a bottle of Califor nia champagne and a lot of razzing greeted Republican Presidential Candi date Ronald Reagan when he reached 65 last week. Reporters on the campaign trail offered application forms for Social Security and Medicare, and composed a ditty to the tune of California, Here I Come. Sample lyrics: "Senior citizens, I'm with you/ Guarantee my boodle too/ Voluntary, actuary, that's all bum/ Social Security here I come." Reagan, who is in fact a voluble critic of the current Social Security system and says he does not intend to claim the benefits for which he is now eligible, accepted the gibes with a crinkly smile.

Then he offered a sample of his own actuarial skills. Said he: "This is the 26th anniversary of my 39th birthday."

After eleven days in the hot climes of Latin America, Margaret Trudeau faced some heat at home last week. Margaret, 27, wife of Canadian Prime Minister Pierre Trudeau, 56, had offended sticklers for protocol by wearing one of her husband's old campaign T shirts in Cuba, by toasting the women's movement during a state banquet in Mexico, and by singing a song she had written for the wife of Venezuelan President Carlos Andres Perez in Caracas. When Margaret heard fans of an Ottawa ra dio show complaining of her conduct over the air, she placed a tearful call to the station. "I don't feel I did anything wrong," she said. "If you rely completely on protocol, you can become a robot."

Margaret, who blamed the strains of politics for her psychiatric hospitalization in 1974, said protocol officers had tried to make "us an elite, separate from the people. And that's not our way."

"Nothing would make me happier," allowed Elliot Richardson during his oath-of-office ceremonies at the White House, "than to serve as Secretary of Commerce until January 20,1981--thus putting to rest the notion that I can't hold a job." Richardson, 55, is a former Secretary of Defense, Secretary of Health, Education and Welfare, Attorney General, Under Secretary of State and the U.S. Ambassador to Britain. "I may be at this very moment entering the Guinness Book of World Records as the most sworn-in of Americans," quipped Richardson. "If I hadn't been moving so fast from place to place, I might well have become the most sworn-at of Americans."

She's a prim and proper chambermaid in television's Upstairs, Downstairs and a spinster with mail-order falsies in Broadway's Habeas Corpus. "I've been doing a lot of plain parts," concedes Actress Jean Marsh, 41. "At one time I wanted to get away from pretty ladies' roles. Now I want them back." On Feb. 22 and 29, she's getting one, in a TV tribute titled Mad About the Boy: Noel Coward--A Celebration. The two-part show has Marsh singing, dancing and reciting Cowardian dialogue. All that for $300 per show, a skimpy paycheck made necessary by CBS's production budget. "I'd rather have the honor," says Marsh. "You know, the cachet, not the cash." "Compulsively watchable," cooed the Daily Express. Purred the critic from the Daily Telegraph: "It's been a long, long time since I saw a theatre so filled with joy." Backed by a big band for her first show at the London Palladium, Actress Shirley MacLaine sang, danced and showed few of her 41 years. "My muscles are better, my breathing is better, and that's because I'm more relaxed," said she. "When you know who you are and you realize what you can do, you can do things better at 40 than when you're 20."

"There's something ludicrous in watching a chiffon dress freeze," remarked former Talk Show Host Dick Cavett, referring to the Arctic scene in his fashionable Manhattan apartment.

A flood in the basement three weeks earlier had left Cavett, his wife, Actress Carrie Nye, and other tenants without heat, running water or electricity. Despite their complaints, repairs lagged, and by the time a cold spell struck, bursting pipes and flooding apartments, the Cavetts had packed off to a nearby hotel. Returning home only for fresh clothes, the entertainer would carry as heater into the bathroom for warmth.

"When I couldn't see my breath in the mirror any more, I'd change," he recalled. "I felt like Clark Kent."

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