That's right. The pop star wrote this in the Anne Frank House vistors' book:
"Truly inspiring to be able to come here. Anne was a great girl. Hopefully she would have been a belieber."
But now Anne Frank's stepsister, Eva Schloss, who was a close childhood friend of the brave diarist, has told a newspaper: “She probably would have been a fan. Why not?
Auschwitz survivor Schloss knew Anne before their families were forced into hiding by Nazi persecution in Holland.
She now lives in Maida Vale, London and has written a book called 'After Auschwitz'.
The museum - which is built into the house where Anne and her family hid from the Nazis during the Second World War - has also spoken out in defence of Bieber, and said they were "a bit overwhelmed" by the backlash.
"His comments were quite innocent," a museum spokeswoman told Reuters. "He was here for more than hour and interested in Anne Frank's life, and that for us is the most important thing."
Not one to hide away from controversy, Bieber hit back at people criticising him for his note with some half-naked Twitter snaps this week... as you do.
Were you surprised that the 19-year-old multi-millionaire who's been named the third most powerful celebrity in the world somehow managed to make the Anne Frank story all about him?
Here are some funny Twitter reactions to the story...