Dressed in his yellow jail uniform -- "
Cake Boss" co-star
Remy Gonzalez strolled into a NJ courtroom this morning ... where the man accused of sexually assaulting a minor learned that he will face a grand jury.

As we first reported, Gonzalez -- who is married to "Cake Boss"
Buddy Valastro's sister -- was charged with aggravated sexual assault, sexual assault, criminal sexual contact, and endangering the welfare of a child after his August 18 arrest.
During a brief hearing in New Jersey today, the judge decided to refer all charges against Gonzalez to a grand jury -- which will ultimately decide whether the case will go to trial.
Gonzalez is being held on $300,000 bail.
TMZ has learned one of the stars of "
Cake Boss" has been arrested for sexually assaulting a minor.

According to law enforcement sources
Remy Gonzalez is currently being held in Morris County Jail in New Jersey ... he's been there since August 18 when cops arrested him.
Officials tell us Gonzalez -- who is married to "Cake Boss"
Buddy Valastro's sister -- is charged with aggravated sexual assault, sexual assault, criminal sexual contact, and endangering the welfare of a child. He's being held on $300,000 bail.
A rep for TLC, which airs "Boss" says, "We support Buddy and the Valastro family during this very difficult and challenging time .... and as this doesn't involve us, we will not be commenting any further."