When Adam “DJ AM” Goldstein took his own life, few people were more upset than his ex-fiancée Nicole Richie. But her sorrow may soon turn to anger, now that Star is exposing a secret DJ AM was desperately hiding — he had a fling with Nicole’s best friend, Paris Hilton!

In this week’s issue of Star, we have exclusive photos of DJ AM and Paris getting cozy at Toronto International Film Festival party in September 2007.

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“They got more and more affectionate as the night went on, until they were all over each other. There was no doubt she wanted him,” an eyewitness tells Star.

Later, DJ AM and Paris retreated to the same hotel room and weren’t seen again until the next morning, the source says.

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