The couple got engaged over the festive period, and are keen to tie the knot as soon as possible. They have now sparked rumours they are hoping to start a family in the near future, after an interior designer was called in to create a nursery at their Los Angles home. "She`s planning a bit ahead," a source explained. "But it won`t be long. They talk about starting a family all the time." Kristen, 29, called in Kari Whitman to overhaul the home she shares with Dax, giving specific instructions that a spare bedroom was to become a nursery. The actress and her 35-year-old fiancé are yet to announce when they will marry, but are said to be keen to make the ceremony as low-key as possible. "Both hail from the Detroit suburbs and are determined to honour their roots by throwing a Motown-y shindig, rather than a posh bash," a source has said.