The 18-year-old heartthrob poked fun at himself in character as the president of Miley Cyrus' fan club.
"Miley you’re seriously my favorite singer of all time," he said. "You’re light years better than that douche Justin Bieber. ... He looks like a lesbian."
Bieber's character also said he "heard" that Bieber was "really sorry" for his alleged pot use.
"I also heard he got busted for smoking weed and he's really sorry about it and people make mistakes and he's never gonna do it again," he said.
Last month, TMZ uncovered photos that appeared to show the pop star smoking a joint with rapper Lil Twist in a Los Angeles hotel room.
Bieber never issued an official apology for the incident, though he did tweet Jan. 5 that he was still "learning."
everyday growing and learning. trying to be better. u get knocked down, u get up.— Justin Bieber (@justinbieber) January 5, 2013
Watch Bieber's Black History Month-themed "SNL" monologue below: