Prince George was in class at his brand new primary school when police say a woman in her 40s attempted to break into the building.
The woman was arrested Tuesday on the grounds of Thomas's Battersea, which the 4-year-old Prince just started attending last week. Cops say George was in class at the time, along with 560 other students aged 4 to 13.
According to reports ... the suspect was arrested on suspicion of attempted burglary. Cops say they're reviewing security arrangements at the school on the heels of the incident.