TMZ posted some pictures that allegedly show JUSTIN BIEBER smoking pot in a California hotel room.  He hasn't admitted to it, but after the pictures hit the web, he Tweeted, quote, "Everyday growing and learning. trying to be better.  u get knocked down, u get up.  Back on tour tomorrow.  Ready to see u all smile.  Time to do what I'm supposed to be doing . . . performing."

They were taken last Wednesday.  (--You can check them out Here.  He's definitely smoking SOMETHING.) What do you think?