Answer:
According to a report from The Daily Beast, the stars of Bravo's Real Housewives series earn at least $30,000 an episode and sometimes up to $100,000.
See related links for the full report on salaries for stars of Real Housewives and The Hills.
I read an article that said they got paid only $8,000 for the entire first season. Supposedly, they will now be getting around $30,000 per episode. I think there are 12-14 episodes per season, which would be roughly $360,000 - $420,000 per season. Jill did an interview and said they were in negotiations for 2-3 months, and the tv producers were lining up alternatives in case they weren't able to reach an agreement.