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 >>/76079/
Take everything I say here with a grain of salt as I'm no pharmacist nor a doctor, but I'd say yes.
She's always had a big chest (runs in the family) but the weight gain medication probably made them bigger. She has the body type that stores more fat in the chest. There's also some pictures where you can see what looks to be stretch marks on her cleavage, an indication of rapid growth/weight gain.
Again, I'm not a doctor so I have no clue what I'm talking about its just a hypothesis.