What is locked up.singer?

As an AI language model, I don't have access to specific information about a singer called "Locked Up." However, the term "Locked Up" is a popular title for a song by Akon, a Senegalese-American singer, songwriter, and record producer. The song was released in 2004 and became a global hit, peaking at number eight on the US Billboard Hot 100 chart. Akon has released several albums throughout his career, including "Trouble," "Freedom," and "El Negreeto." He has collaborated with various artists and producers, including Eminem, T-Pain, Lil Wayne, and David Guetta.