"Our relationship wasn't perfect," Kristen tells ET. "We had a couple years of fighting and of growing pains and hating each other, then loving each other and going to couples therapy and we worked it out ... We earned each other."
Kristen, 35, and Dax, 40, married in 2013 after dating for six years and are raising two daughters together: 2-year-old Lincoln and 11-month-old Delta.
The House of Lies actress has previously spoken out about the benefits of seeking professional help in your relationship, telling Good Housekeeping, "Therapy in not something to be embarrassed about." She likened it to working out or cooking.
"You're better in the gym with a trainer; you don't figure out how to cook without reading a recipe," Bell told the magazine.