JUSTIN: TIME TO MAN UP!

Take the stand & stick it to Diddy

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Sean Combs took young Bieber under his wing

JITTERY Justin Bieber is reportedly terrified that his public image will be totally trashed by the trial of his former mentor Sean “Diddy” Combs — but the reality is that the Biebs was just an underaged teen at the time and allegedly another pathetic victim of the accused sex fiend.

As GLOBE has reported, a number of celebs are quaking in their boots, fearing they'll be called to testify against Diddy — who's now in a federal slammer awaiting trial on sex charges, including forcing gals to take part in shameful orgies he called “Freak Offs." The rap mogul has denied all charges.