Cast
Justin Bieber
Self (singing voice)
Nicole Scherzinger
Self (singing voice)
Jennifer Hudson
Self
Jennifer Nettles
Self (singing voice)
Josh Groban
Self
Tony Bennett
Self (singing voice)
Mary J. Blige
Self
Toni Braxton
Self (singing voice)
Michael Jackson
Self (archive footage)
Janet Jackson
Self (singing voice)
Barbra Streisand
Self (singing voice)
Miley Cyrus
Self
Enrique Iglesias
Self (singing voice)
Jamie Foxx
Self
Wyclef Jean
Self
Adam Levine
Self
Pink
Self (singing voice)
BeBe Winans
Self (singing voice)
Usher
Self
Céline Dion
Self (singing voice)
Orianthi
Self
Fergie
Self
Nick Jonas
Self
Mary Mary
Self
T.I.
Self
Isaac Slade
Self
Carlos Santana
Self
Lil Wayne
Self (singing voice)
Akon
Self (singing voice)
T-Pain
Self (singing voice)
LL Cool J
Self
will.i.am
Self (singing voice)
Snoop Dogg
Self (singing voice)
Nipsey Hussle
Self (singing voice)
Busta Rhymes
Self (singing voice)
Swizz Beatz
Self (singing voice)
Iyaz
Self (singing voice)
Mann
Self (singing voice)
