It’s virtually impossible for celebs NOT to run into eachother at the star-studded iHeartRadio Music Festival, and when they do it always makes for a special moment! Check out some of the highlights overheard backstage at the MGM Grand Las Vegas.Billie Joe Armstrong to No Doubt: “Best band here this weekend!”Kathy Griffin told Tre Cool of Green Day she loved his set and that No Doubt is the best band here (oopsie!)Flavor Flav to Miley Cyrus: “Gwen Stefani!!!” (Miley just went with it, FYI, but after someone made Flav aware of his mistake, he went back and apologized).Spotted: Miley Cyrus giving her number to Richie Sambora…

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