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Nicole Richie, Paris Hilton

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Paris used the glossy pages of Elle Magazine to blast Nicole with a string of stinging accusations.

"She (Nicole) cannot stand being around me because I get all the attention and people don't really care about her," barked Paris.

She added: "I've been best friends with her since I was two, but when I brought her on to my show, she got very jealous and turned on me for no reason. It breaks my heart. She was my sister."

The two blondes mysteriously had a falling-out in 2005 after filming the original 'Simple Life.' As for the reason, although neither woman fessed up, Paris laid the blame squarely at Nicole's doorstep, claiming, "She knows what she did."

In her Elle attack, Paris says producers of 'Simple Life 4: Till Death Do Us Part' wanted to film the show without her diminutive co-star.

"They wanted to do it with just me," Paris said. "But we're both under contract together and she has nothing else so she really wants to do it, but I don't."

Meanwhile, Nicole -- who is back with her on/off boyfriend DJ AM (Adam Goldstein) -- recently jetted to Hawaii for a romantic holiday with her guy but left immediately because it was raining!

Nicole and her man got on another flight and headed straight to Mexico where the sun was shining bright.