King Vajiralongkorn says her unprecedented move runs counter to the nation's customs.
Read moreKing Vajiralongkorn says her unprecedented move runs counter to the nation's customs.
Read moreHer decision breaks with the tradition of the Thai royal family publicly staying out of politics.
Read moreJonathan Head
BBC News, Bangkok
The princess has previously starred in films, sung with a pop group and is flamboyantly fashionable.
Read more