Paris Hilton and Nicole Richie Back at Work Together

According to the New York Post, the two celebrities that have not been on the best of terms for the last few months, started shooting Monday the fourth season of their television series.

According to witnesses, the two women did not speak to each other all day.

Hilton and Richie, who were the best of friends, stopped speaking when Richie showed her friends a porn video that featured Hilton. 

In the fourth season of a Simple Life, the two women are living in families of different cultures, in the outskirts of Los Angeles.  They are playing the parts of wives.

According to the newspaper, the two women do not want to work together any longer.