Katherine LaNasa is an American actress who played Sgt. Cathy Tierny on Seinfeld; she made her lone appearance in "The Beard". Katherine has been involved in a few high-profile marriages with Dennis Hopper from 1989-1992 and French Stewart from 1998-2009; she is currently married to Grant Show who, ironically, gained fame from his role on Melrose Place (Melrose Place played a major role in “The Beard”). Katherine has appeared in a number of other films and television programs such as 3rd Rock From the Sun, The Practice, The Campaign, Grey's Anatomy, Valentine's Day along with many more.