Oscar-winning composer Marvin Hamlisch expressed the mood of the East Room Sunday when he told the "In Performance at the White House" audience that the program was a "show about love songs, and I'm sorry she's not here" to be with President Reagan. Of course, everyone knew who "she" was. Nancy Reagan was recovering from breast surgery. The president was there to host the WETA production, videotaped for airing Nov. 18, and Hamlisch told him he was dedicating the concert to "my good friend, whom I miss very much -- Nancy." Reagan said his wife would have loved the romantic music and that she sent her best wishes.

Out and About

Talk about an opportunity. The newly svelte Elizabeth Taylor was told by her movie director that she needed to gain nine pounds and went at it like a trouper. Taylor, who took off 60 pounds last year, is in Italy to film Franco Zeffirelli's "The Young Toscanini" but looked a little peaked for the role of a retired soprano.

It looks as if she's going to get that weight on as ordered. For dinner Saturday Taylor had prosciutto, fettucine with wild mushrooms, a lobster and rice dish, and spaghetti. For Sunday breakfast the actress ordered sweets, then followed up with a lunch of turnips, mashed beans and chicory, artichoke parmigiana, fish, baby shrimp and a sampling of local specialties. If she keeps up like that, she's likely to start hearing from Joan Rivers again.

And still another Kennedy. Michael Kennedy, and his wife Victoria Gifford became the parents of a baby girl last Wednesday. The child, the couple's third, was born at St. Margaret's Hospital for Women in Dorchester, Mass., and was named Rory Gifford Kennedy. Michael, son of the late senator Robert Kennedy, runs Citizen Emergency Corp. in Boston, the company founded by his older brother, Joseph Kennedy, who is now a congressman. Rory was named for Michael's sister ...

Is it over between Charles and Diana? Can it be true? The British tabloid press, as unreliable as it can sometimes be, has raised the specter that the six-year-old marriage of the prince and princess is on the rocks. They have been spending a lot of time apart lately. The British papers have speculated about "another" woman. Charles has reportedly had a long talk about the situation with his sister-in-law Fergie. Buckingham Palace will not comment. The mother-in-law of the "lady in question," identified as Lady Dale Tryon, condemned the reports as "scandalous." A royalty expert says in proper Shakespearean reference, "It's much ado about nothing." As for the principals, Charles was in Scotland for most of the past month hunting deer; Diana was 500 miles away at Kensington Palace in London with the children ...

Daniel J. Boorstin, librarian of Congress emeritus, has dedicated his new book, "Hidden History," to the Library of Congress. It's believed to be the first time anyone has dedicated a book to the library, and Boorstin explained: "The Library has always been dedicated to authors -- I think it's time an author dedicated a book to the Library." Boorstin also added to the dedication page the facsimile of what Ira Gershwin wrote, with a tiny cartoon drawing, when he signed the guest book in the librarian's office June 3, 1966 with part of his lyric from "Of Thee I Sing." Boorstin said he wanted to echo Gershwin's sentiment about the library: " 'Shining star and inspiration -- Worthy of a mighty nation' -- (and I do mean the L.O.C.) -- Ira Gershwin" ...