The ceremony took place at 8am, led by Phuket Governor Nirat Phongsitthaworn and his wife Mrs Kusumal.
Also attending were Vice Governor Teeraphong Chuaychoo, senior provincial officials, representatives from government agencies, local administrative organisations and members of the public.
The event opened with the presiding officer paying respects to the Triple Gem (the Buddha, Dharma and Sangha), followed by Buddhist chanting by monks.
Alms were then offered to monks and novices as part of the annual merit-making ceremony held to express loyalty and gratitude towards Her Royal Highness.
Vice Governors Adul Chuthong, Suwit Phansengiam and other provincial officials joined the ceremony, which is held each year on Dec 7 to mark the Princess’s birthday and allow the public to take part in traditional activities.
Officials said the ceremony reflected respect for the institution of the monarchy and promoted unity among the people of Phuket, said an official report of the event.
Princess Bajrakitiyabha is the first grandchild of King Bhumibol Adulyadej and Queen Sirikit, and the only one of the seven children of His Majesty King Vajiralongkorn born to his first wife Princess Soamsawali.
In December 2022, Princess Bajrakitiyabha collapsed as a result of a heart condition while out walking her dogs, and has remained in a coma since.