Campbell toured the Palestinian city where she lit candles in the Church of the Nativity, reported Sun online.
"I'm happy to be here. Weapons and war, greed and oil... I hope it all stops. I care about health, about good vibrations, not destruction," she said.
Her visit sparked rumours that she was to wed Russian billionaire boyfriend Vladislav Doronin, 50, after she left her hotel in a white dress.