The 35-year-old actress gave birth to twins, daughter Violet Moon and son Knox Blue, a week ago on March 1, at home in Los Angeles, reported Ace Showbiz.
Shahi and 'Shameless' actor Howey, 37, married in 2009. They are also parents to 5-year-old son William Wolf.
The actress is currently on maternity leave after learning she was expecting while filming her show last fall. She is expected to return when her schedule allows.