Back in their Simple Life heyday, Paris Hilton and Nicole Richie would have happily flaunted the fact that they’re dating twin brothers. But not once in the four months since Paris started dating Good Charlotte rocker Benji Madden, 29, have the couple been spotted with Nicole and her boyfriend of about a year and a half, Benji’s twin brother, Joel, who’s also in the band. In fact, the last time Paris, 27, and Nicole, 26, were photographed together, Nicole was still pregnant with her and Joel’s daughter, Harlow — who’s now 6 months old!

Read more about Paris and Nicole’s dwindling friendship in the new issue of Life & Style, on newsstands now!