The A-list couple was said to be planning their wedding at their French chateau, but Pitt and Jolie were spotted a week ago at a restaurant in Halkidiki, northern Greece, reported New York Post.
"Angelina was in white, but she laughed and said 'not yet' when the restaurant owner asked if she was getting ready to be married.
"She also said, 'We love Greece too much to leave... We have other islands to go to before heading back to France," said a source.
The source added that Jolie, Pitt and their kids were travelling on a super-yacht and had visited islands including Mykonos and hoped to visit Santorini. Guests in the local restaurant were stunned to see them, but were banned from taking photos.
Other stars vacationing in Greece include Robert De Niro and John Travolta, who were seen admiring the Acropolis museum in Athens in early August and relaxing on a yacht. And Tom Hanks was seen taking a swim off the island of Antiparos.