Paris Jackson Pics Debbie Rowe Will SUE Pic Sellers

Debbie Rowe is furious that someone sold pictures of her daughter, Paris Jackson, at a boarding school where she's been for more than a month ... and she plans to sue the people who sold her daughter out ... We have learned.

Sources connected with Rowe tells ... Paris' mom is extremely upset that someone at the boarding school -- located outside California -- has not only sold pictures but information about the girl.

The pictures -- one of which was plastered on Twitter (above) -- were taken a month ago during a graduation ceremony, shortly after Paris arrived. By the way, the plan was for Paris to attend the school on the QT ... she used a pseudonym. Rowe is beyond angry, telling friends,
"These people, including some websites, are screwing with my daughter's ability to get better." Paris had attempted suicide in June after taking pills and slitting her arm with a meat cleaver.

We're told Rowe wants to post her promise to sue, because she wants people at the school and everyone else to stop selling out her daughter for cash.