Boy-band superstars NKOTBSB have unveiled a new series of European tour dates for next year, while Backstreet Boys vocalist Howie D. has announced he will be touring with Britney Spears on a handful of South American dates next month.

The joint group consisting of BSB and New Kids on the Block, who previously announced a set of European tour dates, have added eight new concerts to their 2012 road trip, including shows in Germany, Belgium and Norway.

Meanwhile, Backstreet Boys member and PopCrush contest partner Howie D., who is about to drop his first solo album, announced that he would open for Spears on five South American shows in late November. We can't wait to see how Howie commands the stage on his own!

Here's the updated list of NKOTBSB tour dates and the details of Howie D.'s shows with Britney Spears.

Updated NKOTBSB European Tour Dates:
4/20/12 Belfast, U.K. | Odyssey Arena
4/21/12 Dublin, Ireland | O2 Dublin
4/23/12 Liverpool, U.K. | Echo Arena
4/24/12 Manchester, U.K. | MEN Arena Manchester
4/26/12 Newcastle, U.K. | Newcastle Arena
4/27/12 Birmingham, U.K. | LG Arena Birmingham
4/28/12 London, U.K. | O2 Arena
5/1/12 Rotterdam, Netherlands | Ahoy
5/2/12 Antwerp, Belgium | Sportspalais
5/5/12 Stuttgart, Germany | Schleyerhalle Arena
5/6/12 Leipzig, Germany | Arena
5/7/12 Berlin, Germany | O2 Arena
5/9/12 Hamburg, Germany | O2 World
5/10/12 Oberhausen, Germany | Kopi Arena
5/12/12 Herning, Denmark | Jyske Bank Boxen
5/13/12 Malmo, Sweden | Malmo Arena
5/14/12 Oslo, Norway | Oslo Spektrum

Howie D. South American Tour Dates With Britney Spears
11/20/11 La Plata, Argentina | Estadio Ciudad de la Plata
11/22/11 Santiago, Chile | Estadio Nacional
11/24/11 Lima, Peru | Explanada Estadio Monumental
11/26/11 Bogota, Colombia | Parque Simon Bolivar
11/28/11 Caracas, Venezuela | Universidad Simon Bolivar