Lil Za, Justin Bieber's best friend, has been arrested twice in the past two days, each for separate charges. Throughout the Canadian-born singer's young career, he's hung out and collaborated with some of the biggest artists of our genre; so it's no surprise the 20-year-old crooner often keeps rappers as company. In recent history, hip-hop culture has heavily influenced both Bieber's style preferences and newest music material. The vocalist's latest album, Journals, boasts contributions from Lil Wayne, Chance The Rapper, Future, R. Kelly, and Big Sean. In past projects, he's worked with Ludacris, Nicki Minaj, Juicy J, and much more celebrated songwriters and producers with rap song credits. Scroll though the gallery above to catch some of our favorite photos featuring Justin Bieber hanging out with famous rappers.