Justin Bieber Source Spills on Selena Gomez Split, Chris Guerra Harassment

Justin Bieber was NOT smoking pot behind the wheel this week, but he HAS split with Selena Gomez once again.

So says a close especially close to the singer in response to the death of Chris Guerra, who was hit by a car on Tuesday night while pursuing Bieber.

A friend of the late photographer says Guerra called him prior to his passing and said he saw Justin smoking up whole driving and was hoping to break that major story.

But this Bieber mole makes it quite simple: That's a lie.

The source says various witnesses can confirm that Bieber only left the Four Seasons on New Year's Day to get lunch at Roscoe's Chicken and Waffle.

Moreover, there's no way Guerra could have seen Gomez with Bieber  - as he allegedly claimed - because the two fought in Mexico on December 30  and BROKE UP.

She was never at the Four Seasons and she hasn't spoken to Justin in days.

Finally, this insider said Bieber didn't think this occasion was appropriate to admit it, but he had "very little respect" for Guerra because the reporter constantly stalked and harassed the artist in an attempt to snap pictures and get a story.

Chris made life "very difficult by telling lies about Justin," according to the latest TMZ mole.

Whose side do you believe, readers?