At the ceremony, both Snook, 36, and Culkin, 41, emerged victorious in their respective categories for their roles on the series, which wrapped up after four seasons last year.
He was predicted to have a clean sweep of wins this award season. But Cillian was dealt a shock snub at Critics Choice Awards as he lost the Best Actor gong to Paul Giamatti.
Jonathan Bailey dedicated his Critics Choice Award to every LGBTQ+ person living in a bigoted community which still surround us in his emotional acceptance speech.