Camilla, Queen Consort, is said to be determined to make Kate Middleton's life a "nightmare."
This information was provided to Radar and Ok Magazine by a palace insider.
Camilla and Princess Diana's feud worsened after King Charles ascended to the throne.
Camilla is said to have asked Kate to curtsy in order to demonstrate her superiority.
Kate and William will be present at King Charles' coronation in May.
Camilla is enraged by the thought and fears Kate will steal her thunder.
According to the insider, Camilla can't stop gloating.
Camilla and Kate's feud is reportedly getting worse.
According to the source, Camilla is envious of Kate's popularity and position within the royal family.