Maybe he is a fan, or maybe he knows Blue Ivy may one day be a fan, or maybe he wants to see what one of the world's best-selling pop act is doing.
Either way, accept it -- Jay-Z was seen at Justin Bieber's Brooklyn concert.
All over Bieber's timeline is news that the rapper/entrepreneur/Beyonce's man was at the Bieber show.
"Meant alot to have the man himself come show love tonight. thanks @JayZ ...happy to be in Brooklyn today," Bieber tweeted last night.
Bieber also announced that a portion of his ticket sales was going to a Sandy victims.
Here's what a couple of people tweeted about Jay-Z at the concert:
@believetour92: "so crazy our small town boy from Canada had the JAYZ at his show @Justinbieber #proud of you #bieberinbrooklyn."
@IamBHarv: "yo the show in Brooklyn was crazy, lil bro @justinbieber killed as usual and Jay-Z was in the building."
And tehre are already a couple of videos on YouTube from last night's concert ... Enjoy them:
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