I have to admit, when I saw the comment about his signature in the OP, my first thought was, "That's kind of petty."
Then I looked at the signature, and I'll be damned, that is quite the odd signature for an adult male. It is really round and loopy like a young girl who is learning to write. One could easily imagine doodlings on the face of a spiral notebook in that script, with hearts and, "Mrs. Justin Bieber".
Seriously an odd signature. I apologize for my stupid immediate thought.
The signature doesn't matter of course. Just remarkably odd.