Shawn Johnson to Face Off with Alleged Stalker

6/5/2010 4:03 AM PDT

Shawn Johnson to Face Off with Alleged Stalker

Olympic gold medalist Shawn Johnson will be forced to sit in the same room as her alleged stalker next week -- when she will personally testify against the guy in L.A. County Superior Court.

TMZ has learned Johnson will take the stand at the trial of Robert O'Ryan -- who's facing several charges including felony stalking, felony commercial burglary and two misdemeanor counts of carrying a loaded firearm in his car -- all over a very close encounter with Johnson last year.

As we first reported, O'Ryan was arrested back in March 2009 after he allegedly tried to break onto the set of "Dancing with the Stars" in an effort to confront Shawn -- while packing two loaded guns and duct tape in the trunk of his car.

The trial is scheduled to begin Monday morning.