Hollywood couple Tim Burton and Helena Bonham-CARTER have bought an antique 19th century caravan to help house their growing family. Burton and Bonham-Carter, who is pregnant with their second child, already boast an unusual living arrangement - they share two London houses with interconnecting doors, to allow them their own space. Now the actress is expecting a sibling for three-year-old son, Billy Raymond Burton in December (07), the couple have applied for planning permission to house an authentic $18,000 (GBP9,000) shepherd's hut for their garden. According to their local newspaper, the Camden New Journal, the hut will "accommodate the expanding family."