Question: Which American singer appeared in music videos for R&B group B2K and also featured on the mixtape Detroit by American rapper Big Sean? 
Related documents: [0]  [DOC] Detroit is the fourth mixtape by American rapper Big Sean. It was released for free download on September 5, 2012, by G.O.O.D. Music. "Detroit" features guest appearances from these fellow rappers such as J. Cole, Juicy J, King Chip, French Montana, Royce da 5'9", Kendrick Lamar and Tyga - along with track narrations by Common, Young Jeezy and Snoop Lion. Wale and Wiz Khalifa are also featured in the bonus tracks. American singers includes Chris Brown, Jhené Aiko, James Fauntleroy and Mike Posner. Production derives from Hit-Boy, Da Internz, 808 Mafia's own producers Lex Luger and Southside and KeY Wane, among others. The mixtape primarily consisted of these completed original songs. [END] 
[1]  [DOC] Jhené Aiko Efuru Chilombo (born March 16, 1988), known as Jhené Aiko or Jhené, is an American singer and songwriter. She embarked on her music career contributing vocals and appearing in several music videos for R&B group B2K. At the time, she was known as B2K member Lil' Fizz's "cousin", though she is not actually related to him. It was used as a marketing tool, suggested by Sony and Epic Records, to promote Aiko through B2K and attract an audience. In 2003, Aiko was set to release her debut album, "My Name Is Jhené", through her labels Sony, The Ultimate Group and Epic, however the album was never released, with Aiko asking to be released from the label in order to continue her education. [END] 
Answer: 
Jhené Aiko
Jhené Aiko