Verified answer

It's a sign of loyality to a higher authority. Check out this source!

"You are my religion" - from her song Teeth off the album.

I think it represents the religious status associated with fame, for instance I think of GaGa as a godly figure as do many of her fans.

Well I know one thing.... She is FAR from a Catholic/Christian. Someone once told me that an upside down cross represents evil....