This past weekend in Downtown West Palm Beach, Florida, the annual Sunfest concert took place with Taking Back Sunday and Mike Posner among the performing artists. The singer was spotted wearing the Air Jordan IV Retro “Thunder” while on stage performing his concert set. Released back in 2006 as part of Jordan Brand’s “Thunder and Lightning” pack, Mike Posner rocking these is certainly a rarity due to their limited nature. Check out more images of Posner’s performance and stick Jordan’s Daily for more celebrities in Jordan’s sightings.