Is Uma Thurman pregnant or merely fattish? "Page Six" thought the actress looked a little "puffy" in recent photos, so the other night at the Gucci benefit they asked her new boyfriend, Swiss banker and Elle Macpherson baby-daddy Arky Busson, if Uma was up the spout. "No," he said, and then he made a grave, grave error in judgment: "She quit smoking," he said. Oh, Arky. We understand that you are foreign, but don't you know that the number one rule of American boyfriendry is to never, ever acknowledge, even obliquely, that your girlfriend has gained weight? You're going to have a lot of groveling to do this Valentine's Day, dude.