Jane Fonda is celebrating the 40th anniversary of her classic movie “Klute” with a “fashionoriented, young, hip” event at the Darby, she tells us. Bravo host Andy Cohen will interview Fonda at the bash to benefit her teen-pregnancy- prevention organization, G-CAPP, and tickets for the Thursday event are available on the charity’s Web site. “There is a lot more emphasis on celebrity now,” Fonda says of show business four decades after she won an Oscar for “Klute,” which stars Fonda playing a call girl opposite Donald Sutherland as a cop. “Maybe if you can become enough of a celebrity [today], you’ll be hired as an actor,” she said. The Darby bash will feature an auction of items including a Jimmy Buffett guitar.