The divorce is final, but the squabbling goes on for Christie Brinkley and ex-hubby Peter Cook, who now accuses her of withholding the passport of their 13-year-old son, Jack, denying him a trip to Egypt with his dad. “Everything she does, she does to interfere with my time with my children,” Cook told The Post’s Selim Algar. The trip was offered through Jack’s exclusive East End school, the Ross School. Sources said Brinkley was served the papers during a school concert, and threw them up in the air. “His latest filing is unfounded, unwarranted and petty,” her lawyer Peter R. Caronia said.