But... but... but... yes, exactly. Today we celebrate the semi-skin-shy, those asstacular actresses who want to dive into the world of skin, butt do so ass-first. From Anna Faris's super-tight tush in The House Bunny to Lisa Edelstein's recent rump-flash on House M.D., these are the top 10 actresses who have ONLY shown butt during their ca-rears!