are upgrading their sister status with yet another set of matching tattoos. The 20-year-oldFamous in Lovestar and her 24-year-old "twin" recentlyinked But it's actually a former classmate we should be thanking. "I was at USC in music school and this guy was sitting in on my songwriting class for a semester. It turned out he was from the band Phantom Planet," says the 23-year-old. "We started writing together with his ex-bandmate Sam Farrar—also from Phantom Planet—who was managed by Jordan Feldstein, Maroon 5's manager. We met, and then Jordan sent Adam one of my videos." A deep dive into Google will reveal the two stars singing and dancing (oh, thedancing in Nashville. While their website doesn’t list prices (a tell-tale sign of expensive entreés!), the restaurant’sYelp page