Backstreet Boys (often abbreviated as BSB) is an American vocal group, formed in Orlando, Florida in 1993. The group consists of AJ 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) along with their self-titled 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).