The former “Office” star took to Twitter to tell the world, “What better way to celebrate the 4th… than to announce our 4th family member!!! 2 weeks ago we met our beautiful daughter Violet #Happy4th.”
The couple, who wed in 2010, are also parents to Hazel, 2.
Earlier this year, Blunt opened up to C magazine about her second pregnancy.
“The first pregnancy is the most self-indulgent thing in the world because you get massages and prenatal yoga and hypnotherapy CDs. During this one I forget that I’m even pregnant. I’m hoisting my 2-year-old around!”