Are we going to breaking a copyright law?

As you can tell from the name, we print on balloons.
We are considering printing some Justin Bieber latex balloons. The way we would do this, is by taking a photo of a photo, converting this image to black and white as we only print in a single colour, and crop the image to have just his head. Underneath a small bit of text, something like 'I Love Justin' or along those lines.

How do we stand with this?

Thanks in advance