The Hollywood actor was spotted among the throng of celebrity guests at Jen's birthday bonanza last weekend.
After Brad Pitt caused a Twitter storm with his surprise entrance into ex-wife Jennifer Aniston's 50th birthday bash last weekend - the real reason behind his invite has been revealed.
Former Friends star Jennifer had thrown an epic shindig on Saturday night, inviting the great and good of La La Land to join in the celebrations.
Rubbing shoulders with the likes of the Clooneys, Demi Moore and Gwyneth Paltrow was Jen's ex hubby Brad - who she once memorably described as 'missing a sensitivity chip' following their split in 2005.
But according to Brad's pals, the one time Hollywood power couple are now back on good terms and aren't afraid to hide it.