07/23/2009 05:12 am ET | Updated May 25, 2011

Harry Potter Star Michael Gambon Has Second Baby With Mistress

Sir Michael, who plays Hogwarts headmaster Albus Dumbledore, had the child with his MISTRESS.

His WIFE knows he is raising a second family and he splits his time between their two homes and a bachelor pad in London.

The baby -- named William -- is the second Sir Michael has had with 43-year-old set designer Philippa Hart.

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