Backstreet Boys perform for their "This Is Us" tour in Belgrade, Serbia

The Backstreet Boys (L to R: AJ McLean, Brian Littrell, Howie Dorough and Nick Carter) performed in concert Tuesday night (Dec 15) at the Belgrade Arena in Belgrade, Serbia. The pop quartet is currently promoting their latest studio album This Is Us and will be on tour until March 2010. More pics for you to check out after the break!

AJ Mclean of the Backstreet Boys perform for their "This Is Us" tour in Belgrade, Serbia

Backstreet Boys perform for their "This Is Us" tour in Belgrade, Serbia

Backstreet Boys perform for their "This Is Us" tour in Belgrade, Serbia 

PHOTOS: GETTY IMAGES

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