From Ebert's movie review today:

"Responding quickly to the tragedy of Sept. 11, the makers of Zoolander did some last-minute editing. No, they didn't dub over the word 'Malaysia' or edit around the assassination of the prime minister. What they did was digitally erase the World Trade Center from the New York skyline, so that audiences would not be reminded of the tragedy, as if we have forgotten. It's a good thing no scenes were shot in Kuala Lumpur, or they probably would have erased the Petronas Towers, to keep us from getting depressed or jealous or anything."