The American band said on its website that it expected a total of 55,000 concert attendees in HCM City on March 24 and 26 in Hanoi.

According to organisers, the show is the same as the one performed on other stops during the band's worldwide tour.

"BSB has a very strong and loyal fan base here in Vietnam. You can sense the excitement about their impending arrival. Water Buffalo Productions (WBP) strives to produce the highest standards and know that the BSB shows will amazing and memorable," says Stephen Bures, the Deputy General Director of the WBP.

"We haven't had a band perform a show of such magnitude in Vietnam, and the WBP is making sure that this show will be on par with any international performance."

The four members of the group, Nick Carter, Howie Dorough, Brian Littrell and A. J. McLean, will perform at Military Zone 7's Stadium in HCM City and My Dinh National Stadium in Hanoi.

They will sing their hits I Want It That Way, I'll Never Break Your Heart, Straight Through My Heart and others from their This Is Us album.

The performance is part of the tour This Is Us that began in fall 2009 and will continue to the end of this year. They have had 20 shows thus far.

This concert tour is the first to feature dancers since the band's 2001 Black and Blue world tour.

After the show in Vietnam, the group will return to the US to begin a tour with the 1980s-leading band New Kids on the Block.

The vocal group Backstreet Boys was formed in Orlando, Florida in 1993. The band originally consisted of five members, A. J. McLean, Howie Dorough, Brian Littrell, Nick Carter and Kevin Richardson.

The Backstreet Boys have sold over 130 million records worldwide, making them one of the biggest-selling artists of all time.