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Justin Bieber 's a star ... and, in case you somehow forget it, he's got a bright green pimple patch in the center of his forehead to remind you.

The singer-songwriter was spotted out in Los Angeles Thursday heading to catch a private flight ... and, he stared photogs down while leaning out the car window.

Check out the pic ... Bieber's got a thin pair of sunglasses on -- with a small hoop earring in his right ear and a stud planted in the side of his nose.

He's letting his beard grow out and his head's almost completely shaved ... though we guess it's the sticker on his forehead which will probably grab the most attention. Play video content

Bieber's posted about these patches before ... and it seems to be a fashionable way to cover up a blemish -- or, maybe he's just mak

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