Whoa! Mona from "Who's the Boss?" is getting vampy.
Veteran actress Katherine Helmond will have a guest-starring role on for Season 4 of "True Blood" as Caroline Bellefleur, the grandmother of Andy and Portia Bellefleur, HBO confirms to TheWrap.
Helmond will have a two-episode run on the series, starting with episode 4 of the new season, which premieres on June 26.
In addition to her role on "Who's the Boss?" the 82-year-old actress is known for her portrayal of Debra Barone's mother Lois on "Everybody Loves Raymond" and ditzy matriarch Jessica Tate on ABC's 1970s series "Soap."