Justin Bieber was in the Netherlands for a concert in Arnhem Saturday night. He visited the Anne Frank House Friday after opening hours and wrote this in the guestbook.
The Anne Frank House has posted about other celebrity visits in the past.
And this BBC Hague reporter was able to get in contact with the Anne Frank House and this is what they said.
Beliebers then made sure they showed their idol their support on the Anne Frank House's Facebook page.
UPDATE: During Bieber's tour, a guide pointed out that Frank was a fan of pop culture and she might have been a fan of his.
Abraham Foxman, the national director of the Anti-Defamation League, said Anne Frank was a fan of celebrities and pop culture and doesn't have a problem with what Bieber wrote in the guestbook.
"I don't see anything wrong with it," he said.