She Was a lead singer in a late 80's band named "American Girls". They released a titularly named album in 1986 to fair reviews. The band was in fact meant to be part of a film project that never materialized, but they were good enough to reach the level of actual album release.
Hilary, along with fellow actress and friend Daryl Hannah, recently created and published a board game called "Liebrary". A game similar to "Balderdash" but with a literary twist. It is the second game designed by the two actresses, the first, called "Love It or Hate It" was published in 1995 by Tyco Games.