Justin TimberlakeJustin TimberlakeHey-up.

Justin Timberlake's not a happy bunny.

The singer isn't on his usual chirpy form in this pic.

In fact, pained exertion is nearer the mark.

But why's the Trousersnake teaser so blue?

Turns out, he's deep in the midst of throwing some dance grooves.

And they're fairly ker-razy moves at that.

We've always known Justin to be a bit of a snappy dancer who knows his way around a stage.

But the full version of this latest pic would suggest otherwise.

It is, to be blunt, jaw-dropping.

In a way out there kinda fashion.

Prepare yourself for a shock as we reveal Justin mid-jiggy in our gallery of dodgy dancing celebs.