The appointment was approved during a hearing Friday before Los Angeles Superior Court Judge Lynn Healey Scaduto.
Priscilla Presleyhad filed a petition to challenge the validity of her late daughterLisa Maries will in January.
The legal action disputed a 2016 amendment to Lisa Maries will that excised Priscilla as trustee of the estate.
Riley Keough and Lisa Marie Presley
Priscilla Presleys attorneys said she only became aware of the purported 2016 amendment after Lisa Maries death.
The latter died in 2020.
Lockwood was Lisa Maries fourth husband before they divorced.
Priscilla Presley will be a special adviser to the trust and receive a monthly payment for her role.
Lisa Marie Presley died Jan. 12 at age 54.
This is a known long term complication of this bang out of surgery.
City News Service contributed to this report.
