The Met Gala could prove to be very expensive for Offset.

Multiple sources are reporting that the Migos rapper's 150K chain was stolen right from his Manhattan hotel room early Tuesday morning after the big and boujee party.  And it was apparently easy pickings for the thief.

“They had left the door open so people could come in and out of the room,” one cop source said. “The door was left open even when they weren’t in the room.”

Offset is said to have not even realized the chain was gone until he got back home to Atlanta today.

It was Cardi B who gave him the bad news. The Hotel Sixty LES hasn't commented on the theft, and police are investigating.

As for what chain it was, here's the ice Offset brought to the ball:

D R I P G A L A 2018 T H A N K S @versace @donatella_versace

A post shared by  OFFSET (@offsetyrn) on May 8, 2018 at 2:00pm PDT

So it was likely one of those.

[Related: Cardi B's security beats down autograph hound at Met Gala.]