The Social Network star's wife revealed that the couple will launch the shop in San Antonio, the city where she was born.
"San Antonio was the perfect place. I was born there," Chambers told E! News. "Everyone knows us and the people are so sweet."
The bakery, which will be called Bird Bakery, will serve recipes inherited from Chambers's grandmother.
"It's nice to have something you can put your hands on and create," she said.
Hammer recently shot down reports that there will be nudity in Tarsem Singh's Snow White movie Mirror Mirror.
The actor will star opposite Johnny Depp in The Lone Ranger, which is slated to begin production in 2012.