L.A. police confirmed that a man wearing all black and a baseball cap climbed over the singer's security gate using a ladder at midnight on Tuesday.
The thief made it to the balcony of her home when her dogs started barking loudly.
After being alerted by the barking dogs, Demi's live-in house manager went over to the balcony to see a man looking through the singer's bedroom window although luckily she was not home as she was in Boston promoting her new song, "Sorry Not Sorry."
The manager immediately called 911 and then left.
Unforch, by the time police had arrived, the assailant had left.