The New Kids On The Block go shirtless and arm wrestle behind-the-scenes of their current tour

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Inside NKOTB Tour Rehearsals: 'Our Audience Is Always Part of Our Show'

Things haven't changed much for the boys (err, men) of New Kids on the Block -- they're still 'hangin' tough.'

In May, NKOTB -- Jordan, 45, and Jonathan Knight, 46, Joey McIntyre, 42, Donnie Wahlberg, 45, and Danny Wood, 46, -- hit the road for their summer tour called 'The Main Event,' and from the looks of it, boys will be boys when they're off the stage.

In a series of behind-the-scenes snaps provided exclusively to AOL from NKOTB and their Cottonelle 'Go Commando' campaign, the hunky crooners can be seen running around shirtless, arm-wrestling each other, posing in their hotel rooms and more.

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Behind the Scenes of the NKOTB Tour
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The New Kids On The Block go shirtless and arm wrestle behind-the-scenes of their current tour
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In a word -- it's pretty funny to be a fly on the wall on the NKOTB tour, which stopped in 47 cities in the United States and Canada and was supported by the surviving members of TLC and Nelly.

The show is built with production and choreography for every song -- streamer and confetti cannons, even heart-shaped balloons. So basically, it's the perfect show for any boy band reunion and it's not a huge surprise that the guys are up to the same old antics they were decades ago.

Click through for photos of the NKOTB then and now:

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NKOTB then and now
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The New Kids On The Block go shirtless and arm wrestle behind-the-scenes of their current tour

1989 to 2015

(Photos via Getty)

Donnie Wahlberg, 1990 and 2015

(Photos via Getty)

Joey McIntyre, 1989 and 2015

(Photos via Getty)

Jordan Knight, 1989 and 2014

(Photos via Getty)

Jonathan Knight, 1989 and 2013

(Photos via Getty)

Danny Wood, 1989 and 2014

(Photos via Getty)

1989 to 2014

(Photos via Getty)

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