By Belinda Luscombe

WHEN I GROW UP, I WANT TO BE...

Now that she makes $12.5 million a film, DEMI MOORE can afford to hire someone younger to play herself. In Now and Then, a low-budget female-bonding movie she's co-producing, Moore, MELANIE GRIFFITH, RITA WILSON and ROSIE O'DONNELL play second fiddle to the girls who portray them as 12-year-olds. And although GABY HOFFMANN (Sleepless in Seattle), THORA BIRCH (Clear and Present Danger), ASHLEIGH ASTON MOORE and CHRISTINA RICCI (Casper) are young, they know the biz. "I didn't try to act 12," says Ricci, 15. "When people try to act younger, they come off looking stupid." The film is due this fall.

SCHOOLBOY TALES

First Brotherly revelations will be shared with anyone with $29 when the Learning Annex of Los Angeles, which mounts lectures ranging from Kombucha tea mushrooms to house hunting, presents ROGER CLINTON on July 18. He'll speak on "Growing Up and Overcoming the Obstacles of a Dysfunctional Family." Should G.O.P. operatives bring note pads? "It won't damage Bill at all," swears Roger. "It will reinforce his image as a person."

SEEN & HEARD

Straying husband? Language difficulties? Persistent dark roots? The Globe has an agony aunt for you: Ivana Trump. In her first column, she brings what the tabloid's editor calls a '90s perspective to readers' problems. "I know exactly how you feel," Ivana tells a letter writer who says her success scares men. "I'm an attractive career woman and a celebrity to boot!"

And in other Trump news: Harry and Leona Helmsley are suing the Donald for $100 million. The Helmsleys, who lease the Empire State Building from Trump and his Japanese partners, say a lawsuit that Trump filed in February claiming the Helmsleys had mismanaged the landmark (key phrase: "rodent infestation") was an attempt to drive down rental rates and scare off tenants.

AND A PART FOR ARTIE?

A musical based on the true story of a teenager who murdered two 16-year-olds while wearing a nurse's cape? Sounds like a job for Quentin Tarantino. But it's the work of an artist Bob Dole probably likes much more: PAUL SIMON. The singer-songwriter-ethnographer, who says he's "not generally a fan of musicals," is writing The CapeMan with Nobel laureate Derek Walcott and plans to bring it to Broadway next year. In a publicity stunt casting call last week, young a cappella groups competed in a doo-wop contest. The winners, TROY JACK, JAMAL REED, KEN MCKLENDON and JOEDI IMBERT, had the voices for Simon's musical but not the attitude. They want to give the $5,000 prize money to their churches.