The Hollywood couple dampened rumours they are set to split by laughing and gazing lovingly at each other at the 'Inglourious Basterds' after-party at the Baoli club in Cannes on Wednesday.
A source said: "Angelina was laughing and smiling and enjoying her conversations. Brad was also smiling, but not laughing. He looked tired, he seemed more reserved than Angelina."
The couple avoided mingling with many of the other partygoers at the bash in France and their privacy was protected by 10 burly security staff.
The two armed police officers, three bouncers, five bodyguards and their muzzled dogs even made sure the bathrooms were emptied when Angelina or Brad needed to use the toilet.
The pair - who raise six children together - reportedly didn't leave the bash until the early hours of the morning.
Meanwhile, movie director Quentin Tarantino partied hard at the Parisian-themed party with Mike Myers, BJ Novak and Diane Kruger - who all starred alongside Brad in the thriller.
The source added: "He spent a lot of time dancing on the dance floor by himself. They played lots of cheesy party music as well as popular songs from his movies like Kill Bill and Pulp Fiction.