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" Sleeveless shirts, curtain fringes and dance breakdowns were just some of the many, many things that made &amp;#039;90s pop music great. In fact, it didn&amp;#039;t take much else for New Kids on the Block and Backstreet Boys in their heydays to conquer the world. Well, except for the occasional landmark song.  &amp;quot;It feels like 1989 all over again, or 1999 for some of us,&amp;quot; New Kids member Joey McIntyre told the crowd. It&amp;#039;s a confusing statement for those not aware that both bands are currently in the midst of a joint world tour under the guise NKOTBSB, but the intergenerational crowd cheered regardless during last night&amp;#039;s second sold-out show at London&amp;#039;s O2 Arena.  All nine remaining men (out of a possible ten) were noticeably thicker around the edges, but it didn&amp;#039;t hold any of them back during a blistering two hour set in which the opposing groups to&amp;#039;d and fro&amp;#039;d between their respective catalogues. Younger and with more hits under their belt, you&amp;#039;d be forgiven for thinking Backstreet Boys were the real attraction of the evening. On the contrary, &amp;#039;Dirty Dancing&amp;#039;, &amp;#039;My Favourite Girl&amp;#039; and &amp;#039;Step By Step&amp;#039; were deserved highlights by New Kids for their cheesy yet brilliantly slick routines and on point vocals - helped along by the plush production of lights and firework displays. Backstreet Boys were equally unafraid to ramp up the nostalgia, sporting matching white suits for a string of ballads as well as imitating some of their best moves on &amp;#039;Larger Than Life&amp;#039; and &amp;#039;As Long As You Love Me&amp;#039;. However, time constraints meant a section covering most of their biggest moments felt rushed, particularly given their significance on the pop landscape.  Save a curious LMFAO &amp;#039;Party Rock Anthem&amp;#039; interlude and even stranger moment when One Direction&amp;#039;s &amp;#039;What Makes You Beautiful&amp;#039; was played out during a crowd spotting moment, both bands appeared to embrace their age rather than blindly ignore it. Crotch-thrusting not only became the move of choice adopted by all for the evening, it told their now all-grown-up fanbase that yes, the lyrics really were that filthy. Despite reports of fan bickering during the US leg of the jaunt, the end of the night was a victory for all. BSB fans welcomed the news that AJ is to be a father and, more importantly, the announcement of former member Kevin returning for their next album and tour. For NKOTB followers it was a win of a very different kind: that after 25 years, the world&amp;#039;s first proper boyband can still put on one hell of a show.    Have your seen NKOTBSB on tour? Leave your comments in the box below:  Watch NKOTBSB live below:       "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/music/news/a379168/nkotbsb-live-at-the-o2-arena-review/>