What is the square on the megan fox's back at the end of transformers 2?

At the end of transformers 2 when sam and mikala are hugging it zooms in on her back and there is like a square thing that is pressing through her shirt..? does this have to do with the 3rd movie? i know she will not be in the 3rd movie so im just curious. could it possibly be the way she dies? if you dony understand what im saying watch the end scene before there on the ship.What is the square on the megan fox's back at the end of transformers 2?A target.What is the square on the megan fox's back at the end of transformers 2?No idea