The couple has reportedly become parents for the second time, reports US Weekly. They already have a five-year-old daughter Zelig.
However, the couple has not made the new public.
Dinklage and Erica, who got married in 2005, didn't even confirm the pregnancy in an official announcement either.
The news emerged that they were expecting after Erica showed her growing baby bump at the opening night of Broadway show 'All The Fine Boys.' (ANI)