The Backstreet Boys (sometimes referred to as BSB) are an American vocal group, formed in Orlando, Florida in 1993. The group consists of A. J. McLean, Howie Dorough, Nick Carter, Kevin Richardson, and Brian Littrell. The group rose to fame with their debut international album, Backstreet Boys (1996). In the following year they released their second international album Backstreet's Back (1997), and their U.S. debut album which continued the group's success worldwide. They rose to superstardom with their third studio album Millennium (1999) and its follow-up album, Black & Blue (2000). After a two-year hiatus, they regrouped and released a comeback album Never Gone (2005). After the conclusion of the Never Gone Tour in 2006, Richardson left the group to pursue other interests. The group then released two albums as a quartet: Unbreakable (2007) and This Is Us (2009). In 2012, the group announced that Richardson had rejoined them permanently. In the following year they celebrated their 20th anniversary and released their first independent album, In a World Like This (2013). The group also released their first documentary movie, titled Backstreet Boys: Show 'Em What You're Made Of in January 2015. The Backstreet Boys have sold over 130 million records worldwide, making them the best-selling boy band in history, and one of the world's best-selling music artists. They are the first group since Sade to have their first nine albums reach the top 10 on the Billboard 200, and the only boy band to do so. They also received a star on the Hollywood Walk of Fame on April 22, 2013.