Let out the waistline. Director Steven Soderbergh has figured out a way to keep the pregnant Catherine Zeta-Jones in the new movie he’s making with Harrison Ford, the drug-war drama “Traffic.” She’ll be pregnant in the movie, too. Zeta-Jones, who is engaged to marry the baby’s papa Michael Douglas, had to drop out of filmmaker Oliver Stone’s “Beyond Borders,” in which she was to have had a torrid onscreen affair with Kevin Costner. But New York’s Daily News reported that Soderbergh was more accommodating. Zeta-Jones, 30, and Douglas, 55, confirmed last month that they are expecting their first child together but announced no wedding date. Douglas — who is generating positive buzz for his new movie “Wonder Boys” — is also the father of a son, Cameron, 20, from a previous marriage.