Jackie Chan has started shooting his latest kung-fu comedy, tentatively titled “BB” or “Baby,” in Hong Kong with local helmer Benny Chan. Production kicked off before the recent announcement of the “Rush Hour 3” project. Official news agency Xinhua, quoting Huayi sources, said the film began shooting Thursday. Budgeted at $16.8 million, “Baby” is expected to wrap in March and preem in October. Plot revolves around hijinx when small-time crooks steal a car without realizing a child is in it.