Emma Watson in dorm evacuation

Harry Potter star Emma Watson was caught up in an emergency at her university on Tuesday after a leaking steam pipe prompted an evacuation of her dorm.

The actress, who is studying English Literature at Rhode Island's prestigious Brown University, was among a number of students who were forced out of the building in their pyjamas when a fire alarm sounded early in the morning.

A source tells TMZ.com the alarm was triggered by a faulty steam pipe which was later fixed and pupils were allowed to return to their rooms.