OMG -- what can we say about this except that some random girl who was taking a selfie with Justin Bieber yesterday get a very nice surprise when he planted a wet one right on her cheek!

It's every girl's wet dream -- a REAL KISS from Bieber ... and this lucky b*tch got it! Girl, this is one for the books -- a story to share with your friends for years to come -- the kind of story that you'll tell your grandkids -- the kind of thing that will make ALL your friends jealous. And hey, if you're lucky enough, JB will probably have one of his wingmen find you and bring you back to his Beverly Hills pad to party! Unless you're underage, of course ...