What is Lady GaGa's real gender?

I just thought she was female, but my mom said she was most likely born a man or shes transgendered. I tried looking it up, but I can't find any answers. No one seems to know?

I'm not trying to be mean, she has a great voice and I love her music, I'm just curious.
Update: hah, ok now i feel stupid :)
but if you look it up on google there are more questions like that and it made me even more curious.
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