Actor Jeremy Irons, enjoying a night off from his Broadway production of "The Real Thing," came to Washington Sunday night to see his wife Sinead Cusack, who is at the Kennedy Center with the Royal Shakespeare Company starring in "Much Ado About Nothing" and "Cyrano de Bergerac." Irons joined the company in watching the Folger Theatre production of "Much Ado" and then at a party for both casts afterward at the Jefferson Hotel, where he ended the evening singing with Judy Kanez, the Bennett's restaurant pianist . . .

It was quite a day yesterday for celebrity hairdresser Robin Weir. At 6 a.m. he brushed up the locks of Marty Davis, the congressional wife famous for her cutaway exercise leotard and high heels, for her appearance on the "Today" show. Later in the afternoon he worked on Linda Gray (Sue Ellen) of "Dallas" fame before she went to the White House dinner and then found time for the dinner's hostess, First Lady Nancy Reagan. That kind of day could go to a man's head . . .

It wasn't exactly a royal birth, but actors Ryan O'Neal and Farrah Fawcett released an official photograph of mother and new baby boy, Redmond James Fawcett O'Neal, born on Jan. 30. Babies do all look like Winston Churchill . . .

Actress Ali MacGraw has a new idea. Therapy has been such a big part of her life and that of so many of her Hollywood pals that she believes "therapy should be incorporated into the public school curriculum -- so it could be available to everyone." A recent addition to the cast of "Dynasty," MacGraw said in an interview in McCall's magazine that therapy creates a "healthier, more positive person." She said she was reluctant to raise the subject because "it sounds like I'm just some neurotic Hollywood actress." One shouldn't laugh. It's an idea that could catch on, at least in Southern California . . .