Matthew Broderick cheats on Sarah Jessica? The rumor is that while filming "Sex and the City" in Los Angeles, Matthew Broderick cheated on SJP with a 25 year old, red head youth counselor that he met at a bar in New York City.  She has apparently given him the nickname "Matty Cakes."  I feel so sorry for Sarah Jessica Parker if in fact this rumor is true.  The married couple have been on record saying that things haven't always been the best in their marriage.. as a matter of fact SJP wa...