"The Simple Life" feuding co-stars Paris Hilton and Nicole Richie have to put their differences side, as they are both under contract for another season with Fox Network.

Apparently, Fox Network head Peter Ligouri told the Television Critics Association press tour in Los Angeles Thursday he doesn't care about the gossip on his socialite stars, who seem not to stand each other, after their public split last spring. They "will both be ready for work", Ligouri added.

Paris Hilton has repeated in many occasions that "Nicole knows what she did" and lobbied for her new best friend Kimberly Stewart to replace Richie in The Simple Life.

Meanwhile, Hilton has to cope with the attitude of her future mother-in-law, who is rumored to have tried to convince Paris Latsis not to marry her.