Justin Bieber: TMZ Superimposed Spitting Pics ... TMZ: No We Didn't

Justin Bieber is accusing TMZ of a spit-conspiracy ... that we "superimposed" photos to make it appear the singer was spitting on fans last week when he really wasn't.

Here's the problem ... he's speaking out of his hairless, Canadian ass.

Justin's rep issued a statement about the incident ... and if your computer screen starts to smell ... well, you know.

"Justin didn't spit on anyone. No fans were below the balcony. TMZ superimposed photos of the fans next to Justin on a completely different balcony to make it appear like he was spitting on fans when he wasn't. In fact, earlier in the day, Justin bought his fans hot chocolate and played them some of his new music. Justin loves his fans."

First, Justin ... there WERE fans below the balcony. In fact, Justin had posted a video of the crowds below his hotel room on his own Instagram page ... showing him on the same balcony depicted in the photos.

Second, the photos were shot by a reputable photo agency and posted on our site per usual. Also, we're not that good at photoshop (see: here and here).