As if his famous mom's divorce wasn't bad enough -- "High School Musical" star Chris Warren has now filed a lawsuit against BOTH his parents, accusing the pair of stealing hundreds of thousands of dollars of his child acting money.
Warren filed the lawsuit against "Passions" actress Brook Kerr and Christopher Warren Sr., claiming they established a trust for him back in 2001 for all the money he made as a minor -- and have been secretly dipping into the kitty ... big time.
According to the lawsuit, Chris paid into the account for years, but when he decided to make a withdrawal back in 2011 -- as a 21-year-old -- his parents refused to grant him access.
When pressed, Chris claims his parents admitted they had blown through hundreds of thousands of dollars of his money on their own personal expenses ... but refused to say how much was left in the account.
Chris is now suing his parents for all the money back ... even though he's still not sure exactly how much they took.