Big Sean Burglary Victim I Went to Dubai, and Said Bye Bye to Jewelry

12/5/2015 12:50 AM PST

1204-big-sean-TMZ-01Big Sean was a big fat target when he was out of the country last week, and thieves robbed him blind.

We're told burglars broke into his home in the Valley and made a beeline for the safe, where they grabbed around $150k in jewelry. Sean also had some unpublished music in the mini-vault, which was also stolen.

We're told Sean and his people believe it was an inside job ... they think the thieves knew Sean was in Dubai and had a clear layout of the house.

So far, no suspects.