AceShowbiz - Engaged Kristen Bell and Dax Shepard don't want to wait until they're married before they start a family together - the couple is reportedly building a nursery in their Los Angeles home.

Shepard proposed to the "Heroes" actress over the 2009 holiday season, after two years of dating. According to U.S. magazine OK!, the pair recently hired celebrity interior decorator Kari Whitman to redo their home and turn one bedroom into a nursery, ahead of the Hollywood wedding. A source says, "She's planning ahead a bit. But it won't be long. They talk about starting a family all the time."

After ending her five-year romance with Kevin Mann, Bell began dating Shepard in 2007. "I've learned the necessity for healthy communication. How important it is to talk about your deepest, darkest fears and feelings," Bell said about the secret to their relationship. "Your partner should hear your most embarrassing insecurities, because once you say them out loud, you've created a safe zone."