The actor and his wife, actress and singer Bijou Phillips, welcomed a daughter on Feb. 14, the couple revealed on Instagram.
Daughter Fianna Francis Masterson weighed 8 pounds, 5 ounces and measured 21 inches long. "Hello friends. Beyond thrilled to announce the birth of our daughter Fianna Francis Masterson! Mom and baby are doing amazing. You can all refer to me as dj dadpants from now on," the That '70s Show alum wrote alongside the photo below of him holding his daughter.
Masterson, 37, and Phillipps, 33, married in October 2011.