The diva shows off her two-piece during a yachting expedition. Plus: Mandy & DJ AM, Gwen & Gavin and more

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JUST FRIENDS

After Adam "DJ AM" Goldstein came out to support her at an L.A. concert last month, Mandy Moore returns the favor and pops into Stereo By the Shore Club in Southampton, N.Y., to surprise Goldstein, who spun records there Saturday. Though the former couple left the hot spot together, a rep for Moore tells PEOPLE, "They are not dating."