Bieber was drag racing singer Khalil, who grew up in Sacramento.  Just so who is Bieber buddy Khalil?

His biography says he's 19 years old, born in Sacramento, and is an R&B artist who signed with Def Jam recordings but has not had an album released.  In this online video, Khalil talks about what he likes to do...

As far as what he's accomplished so far, perhaps his Wikipedia entry is the most telling.  It describes Khalil as "best known for his association with pop star Justin Bieber."

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