Jennifer Aniston looked absolutely perfectly summery out shopping at Barneys in LA yesterday afternoon, but her hometown isn't the only place where she's a natural fit. John Mayer's friends say that his gorgeous girlfriend is the perfect addition on the tour bus and, "Everyone really loves her." She's got fans all over the place it sounds like — during John's shows, fans can text into a number and get their messages up on the big screen and apparently more than a few concertgoers have requested Aniston to come out on stage with her man. How fun would that be? Talk about getting more for your money from those tickets.