The Death At A Funeral star was appearing on TBS's Lopez Tonight when George Lopez poked fun at 16-year-old Bieber's announcement that he is currently penning his memoirs.
"Justin Bieber is writing his memoirs and his fans are all thinking, 'Mum, what's a memoir?!'" the host quipped in his opening monologue.
"They say he's really into it... He's already on his third box of crayons!"
Wilson then treated the audience to his own Bieber story, saying: "I was in this book store, record store like a month ago, and I went in and was like, 'Can I get that Bieber box set, Bieber the early years?'.
"This woman looked up - she looked like a school librarian - and she was like, 'So, are you going to be a problem tonight?' and I was like 'No, I just thought that was kind of funny!… I'll just go find the self help section'."
Bieber's book, titled Justin Bieber: First Step 2 Forever: My Story, will be published by HarperCollins in October.