Well, there he goes again. The much-married Johnny Carson was secretly married more than a week ago to Alexis Maas, the girlfriend he met on the Malibu beach about a year ago. His publicist Jim Mahoney said the 61-year-old Carson and Maas, whom he described as "about 35," were married by a judge on June 20 at Carson's Malibu Beach, Calif., home. "The only other person in attendance was his brother Dick, a television director, who stood up for him," said Mahoney.

The couple later left for the Wimbledon tennis matches in England, Mahoney said. Carson divorced his previous wife, Joanna, in 1983. The bitter settlement proceedings over the 10-year marriage made gossip column headlines for two years. His other wives were the former Jody Wolcott and Joanne Copeland. And if all his monologues can be believed, his marriages have cost him a lot of money.

Remembering Walter Heller

Family members of Walter W. Heller revealed at his memorial service Friday in Minneapolis that Heller had been aware of a serious heart problem for the past five years, but kept it a secret so "he wouldn't be forced to slow down." The chairman of the Council of Economic Advisers under former presidents Kennedy and Johnson died two weeks ago of a heart attack.

At the memorial service at the University of Minnesota, where Heller had taught for 40 years, former vice president Walter Mondale said Heller's economic philosophy "had a purpose -- to help people. The sense of what he did will endure." Also among the 13 paying tribute to Heller was Yale Prof. James L. Tobin, the last surviving member of the three-man Kennedy council that included the late Kermit Gordon. Tobin said of Heller's management style, "There was a certain amount of anarchy, but great things got done under Walter's style of leadership." Out and About

It was a 30th wedding anniversary party with an unexpected ending Saturday night. Former senator Richard Stone and his wife Marlene celebrated their anniversary at Aux Beaux Champs at the Four Seasons Hotel with a group of friends that included House Speaker Jim Wright and his wife Betty and Sen. Howard Metzenbaum and his wife Shirley. While there, Stone, a Capital Bank vice chairman, noticed songwriter Marvin Hamlisch at the next table. Hamlisch, who was in town to play an "In Performance at the White House," invited the party upstairs to the Garden Terrace Lounge, where he asked pianist Dennis Kaspar if he could take over the keyboard. And with the Stone party standing around the piano, Hamlisch played the "Anniversary Waltz" and two songs from "A Chorus Line" -- "What I Did for Love" and "One." And then he even took a few requests ...

In a week that saw several of the older stars in town -- like Tony Curtis, June Allyson and Barbara Eden -- two of the "coming of age" movie set caused a stir among younger staff members at the National Gallery of Art Friday. The two stars -- Daphne Zuniga ("The Sure Thing" and "Spaceballs") and Judd Nelson ("St. Elmo's Fire") -- had been in town for the Congressional Arts Caucus salute to high school artists, whose work will hang through May 1988 in the tunnel between the Cannon Building and the Capitol. While here, Zuniga and Nelson said they wanted to see the Vietnam Veterans Memorial and the hit "Helga" exhibition at the National Gallery. Some of the younger staff members there were "horrified" that some of the older staffers didn't know who the two actors were ...

First Lady Nancy Reagan, honorary chairman of "An American Vision: Three Generations of Wyeth Art," which opens Saturday at the Corcoran Gallery, will have a private preview of the show tomorrow conducted by artist Jamie Wyeth ...

Superstar Stevie Wonder has been added to the ever-lengthening list of stars who will perform at the July 4 Welcome Home concert at the Capital Centre. Among the other stars scheduled are singers Kris Kristofferson, James Brown, Crosby, Stills and Nash, Neil Diamond, Linda Ronstadt, Anita Baker, John Fogerty, the Four Tops, James Ingram and Richie Havens, actors Ricardo Montalban and Louis Gossett Jr. and comedian George Carlin. The emcees for the show are Jon Voight, John Ritter and Peter Fonda ...