Richie, 24, started dating childhood pal and aspiring musician Jenner, 23, last month--three months after ending her engagement to Goldstein for the second time.
In July, Jenner finished his on/off relationship with Laguna Beach reality TV star Kristin Cavallari.
On Tuesday, Goldstein, 33, attended a Guess party at New York City nightspot Bungalow 8 with 19-year-old Cavallari, sparking rumors they are dating.
However, his representative tells the New York Daily News, "AM is dating, but not Kristin Cavallari. They are just friends."
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