Seems like the romance between Katy Perry and John Mayer is not done yet!Although several sources revealed last week that the couple already split up, the singers were seen together at the FYF concert in downtown L.A. over the weekend. Mayer and Perry were spotted at the VIP section of the music festival, seemingly enjoying each other's company, even dancing and kissing at some point as they watched bands like Sleigh Bells and Purity Ring. ...