From there, it was all about Brangelina.
The event marked a milestone birthday for Jennifer, prompting her to celebrate with all of the people who have had an impact on her life, People magazine reports. Here's the real reason why.
"Pitt made a casual entrance to the hotel where Aniston's party was being held." the medium reported.
Other guests at the party were said to include another of Brad's former flames, actress Gwyneth Paltrow, as well as Jennifer's former boyfriend John Mayer, and the singer's ex-girlfriend Katy Perry, who arrived by motorcycle with her partner Orlando Bloom.
She may have lived for half a century on this planet but Jennifer looks nothing like her age. "She debated back and forth with friends if she should invite him", added the insider.
A few of Aniston's friends gave a glimpse inside the party, thanks to a fun photo booth set up inside.
Aniston married actor Justin Theroux in August 2015 after becoming engaged in 2012.
The person shared: "Basically, every single person who Jen loves attended". See the pics below of Jen living her best life. "But the friendship is shifting and changing, you know, so that part is something that we're both very proud of". The decision "was mutual and lovingly made at the end of previous year", Aniston's longtime publicist, Stephen Huvane, said at the time.
The great and the good of Hollywood turned out to mark a big occasion for Jennifer Aniston last night.
But back to Pitt. Since the show ended in 2004, Aniston has flourished as a movie star, playing key roles in films such as "Rumor Has It", "Marley and Me", and "The Break-up".
The couple were married for two years, splitting in 2017. "They are friends and have supported each other through some tough times".