The 30-year-old actress, who appears opposite Charlie Sheen in the sitcom, is expecting a baby with her hockey player husband, Ryan Miller.
DeWulf tells People.com, "After struggling with a bizarre compulsion to eat French fries and pickles every second of every day for the past 12 weeks, I'm thrilled to announce I'm pregnant with my first child. My husband, Ryan, and I couldn't be more excited."
She is expected to give birth in March (14). The couple has been married for three years.