Not uninvited stops by her house.
But some idiot named Jacob Kulke apparently didn't get that memo, as sources confirm to TMZ the 24-year old was arrested around 1:45 a.m. today after after jumping a fence and trespassing on her property.
Kulke told authorities he was Swift's boyfriend and had taken a bus from Wisconsin to Nashville in order to celebrate her birthday.
But police weren't buying the tale and Kulke was placed in jail. He's beind held on $10,000 bail.
The troubled young man was convicted of battery, disorderly conduct and drug possession in 2010 and placed on 13 months probation at the time.
Thank goodness Taylor came out of this unscathed!