Check out some pictures of the Backstreet Boys from the opening night of their "In a World Like This 2013" tour at Charter One Pavilion on August 2, 2013 in Chicago.

CHICAGO, IL - AUGUST 02: Nick Carter, Brian Littrell, AJ McLean, Howie Dorough and Kevin Richardson of Backstreet Boys perform during the opening night of "In a World Like This" 2013 tour at Charter One Pavilion on August 2, 2013 in Chicago, Illinois. (Photo by Daniel Boczarski/Getty Images)
(Photo by Daniel Boczarski/Getty Images)