Justin Bieber can't be the easiest person to get a birthday present for ... but his dad Jeremy went all out for his son's 19th.

So, what do you get the kid who can buy whatever he wants year round? 

A custom-made Bat bike!


Jeremy showed off his gift for his son online on Friday, posting a video of the motorcycle that's been personalized with Batman logos, some of Justin's tattoos and the words "35 mil. followers" in honor of his Twitter fans.

It's kind of a dangerous present to give your own son ... especially considering how many times he's been pulled over for speeding in his car.

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