The 'Boyfriend' singer has now rapped on several occasions, notably on Chris Brown's New Boy In Detention mixtape. Bieber's new album Believe will also feature him rapping more.
As reported by MTV, Bieber said: "A lot of countries don't get rap music. It is a lot bigger in the US and Canada but not everywhere.
"I am a singer - that is my passion. Rapping is something that I like to do for fun."
In addition to his collaboration with Brown, Bieber has rapped with Busta Rhymes on 'Drummer Boy'.
Bieber announced earlier this week that Believe will be out in June.
Listen to Justin Bieber's new single 'Boyfriend' below: