Lopez even encouraged her fans on Twitter to attend her concert wearing a HALLOWEEN! costume saying, "#Happy Halloween! We have a show tonight in Oberhausen! Let's play dress up! Can't wait to see your costumes. #DanceAgainWorldTour2012."
More PHOTOS of Jennifer Lopez and Casper Smart's HALLOWEEN Costume:
Photos courtesy of Jennifer Lopez's Twitter account
Jennifer Lopez and Casper Smart's HALLOWEEN Costume 2012