She was also Cassiopeia in Clash of the Titans, sexy, willful but not too bright a character.
In non-genre work, besides Rome, she was a main character in the UK State of Play, sexy but not too bright.
But I first noticed her in a thriller with Alan Rickman called Dark Harbor, where she was sexy, adulterous but not too bright.
Atia of course was sexy, magnificently bitchy but not too bright.
I can't say I liked her performance as Clarice because, although she delivered the sexy, willful but not too bright persona she seems to be cast for, the character needed to be bright.
Beautiful woman, sexier than most twenty year olds.