Lily Collins and her co-stars in upcoming action movie “The Mortal Instruments: City of Bones” played real heroes on Monday. A devoted 14-year-old fainted in line for an autograph from Collins, Jamie Campbell Bower and Kevin Zegers at Mall of America. “She made it past Lily but could barely breathe and then her legs collapsed,” said a spy. “The guys helped her to her feet and sat her in a chair. Lily quickly got her a bottle of water.” EMTs arrived and the girl was luckily OK.