Superstar Nagarjuna on Tuesday announced the engagement of his younger son Akhil Akkineni to artist Zainab Ravdjee, just days before the marriage of Naga Chaitanya with actor Sobhita Dhulipala on December 4. "We are thrilled to announce the engagement of our son, @AkhilAkkineni8, to our daughter in law to be Zainab Ravdjee! While Zainab's personal Instagram account remains private, her …