TMZ has obtained Richie Sambora's legal response to Heather Locklear's divorce petition, and it's a sign of trouble.
Sambora is asking the court for joint physical custody of their eight-year-old daughter, Ava. In her petition, Locklear asked for sole physical custody.
Sambora claims the couple separated the day after Christmas last year. He also confirms what Locklear claimed -- that the couple signed a prenup on December 14, 1994. They married the next day.
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