A$AP Ferg stopped by The Observatory in Santa Ana last night and man did he deliver a high-energy performance.  Fergenstein also surprised fans during his set when fellow A$AP Mob member, A$AP Rocky, decided to take the stage and perform a few of his hits like his latest single “Lord Pretty Flocko Jodye 2.”  Take a look as concert-goers went crazy for the New York native.

Filmed by Collective State TV for ItsTheDaily.com