Canadian superstar Justin Bieber joked about smoking pot on this week's Saturday Night Live (SNL).

The star made his hotly-anticipated debut on the hit US comedy show last night (February 9) where he made light of rumours surrounding his personal life.

Earlier this year, Bieber was pictured holding a suspicious looking cigarette - leading many people to speculate whether or not he was smoking marijuana at a party.

The 18-year-old star played the ultimate Miley Cyrus fan in a later skit during his appearance on SNL.

During the hilarious sketch, the character proclaimed her hatred for Justin Bieber.

The heartthrob's tongue-in-cheek character chimed: "I also heard he got busted smoking weed, and people make mistakes and he’s really sorry about it and he’s never going to do it again.”

Earlier in the show, Bieber was joined by Whoopi Goldberg and Ellen DeGeneres. Watch Bieber on SNL here: