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Justin Bieber is walking around London with something to prove: He's the worst dresser out there.

While he may be trying to show off his "swag," the singer -- who turns 19 today -- had just been looking ridiculous with some of his bizarre outfit choices.

Take last night for example, where he was seen celebrating his birthday by parading around shirtless, wearing pants that rode below his butt. This is not the look.

And it's only the latest in a series of dumb ensembles.

Earlier this week he was seen sporting a gas mask for some reason ... and then there's the spiked yellow hat and LMFAO pants that caught everyone's attention on Wednesday.

We're not alone here, right? Justin looks ridic.

Check out all the outfits above and sound off in the comments below!

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