Were Justin Bieber’s muscles and, erm, privates photoshopped for his Calvin Klein campaign?

When Justin Bieber is up to his usual tricks of drag racing down residential streets in Miami, discarding monkeys and falling out of strip clubs, we find him pretty irritating.

But we must admit we did a double take when we saw the pictures from his Calvin Klein ad campaign this week.

Yes, it does look like someone has stuck a child’s head onto a man’s body, which is a little disturbing, but he is in pretty good shape.

We were almost impressed by his six-pack until we saw the video from the campaign and noticed his big man-pecs in the pictures didn’t seem quite as inflated in the clip.

And it seems it’s not just us that thought this, as many people took to Twitter to express their disbelief after seeing the pop brat’s bod.

One user wrote: “Justin Bieber’s head literally looks photoshopped onto someone else’s body lol.”

Another tweeted: “Eerm how photoshopped is his pec?”

Someone else wrote: “Not gonna lie Justin Bieber looks really good in his Calvin Klein shoot, but his abs are definitely airbrushed or photoshopped on.”

Maybe Justin has developed a talent for flexing in all the right places at exactly the right moment. No?

But it’s not Justin’s muscles we noticed – he also seems to be packing quite a lot in his pants.

Maybe he just needed somewhere to keep his socks during the photo shoot or, as one Twitter user put it: “You let them photoshopped your dick.”

GALLERY: Justin Bieber for Calvin Klein