Brunei implemented a law making gay sex punishable by death, so many are boycotting hotels owned by the country's Sultan.
Adultery carries the same punishment under the new Sharia penal code that was fully implemented in the oil-rich kingdom on Wednesday.
“Are we really going to help fund the murder of innocent citizens?" asked the movie star in a scathing op-ed.
Amnesty International condemned the penalties, which also apply to children, as "cruel and inhuman."
Gay people live under the threat of an agonizing death.