TMZ claims that Miley has lost $10K worth of guitars from one of her storage units.
Her instruments collection was reportedly stolen back in October, however, she had only realised that they were gone this week.
The website writes that she "initially thought someone in the family had borrowed them".
Only a few weeks ago Liam Hemsworth, her fiance, took to Instagram to write about the devastating fire that took their home.
Liam continued: “I spent the day in Malibu yesterday and it was amazing to see the community pulling together to help each other out in any way they can.
“Malibu is a strong community and this event is only going to make it stronger. Thankful for the all the great local guys that helped keep smaller fires out around my property.
“I love u guys. I love you Malibu. Thank you to all the hero firefighters around California. It’s going to be a journey to rebuild. Stay strong all.”