"Last night celebrating our handsome Jen ❤️❤️", she wrote. The "We're the Millers" star was reportedly hesitant to invite Pitt, but wanted to celebrate her milestone birthday with those who were important in her life, according to People.
Jennifer Aniston was said to be thrilled that her ex-husband, Brad Pitt, showed up to her 50th birthday party, and had no problem showing some friendly affection for each other in front of her a-list guests. "But the friendship is shifting and changing, you know, so that part is something that we're both very proud of".More news: Watch Cardi B Perform "Money" At The 2019 Grammy Awards
She loves to show off her yoga-honed physique - and she should! "Many of his close friends were at the party too", an insider told the publication.
Pitt and Aniston split in 2005 after five years of marriage.
The two separated at the end of 2017.
Jennifer - who split from Justin Theroux around the same time after two years of marriage - recently insisted she still regards her relationships with both her exes as "successful".More news: Backed Syrian force announces 'final battle' against IS
As a source told Entertainment Tonight, "They are friends and have supported each other through some tough times".
Asked if there's anything she had embraced post split, á la Nicole Kidman and her high heels, she responded, "I can have a comfortable couch". And when they came to an end, it was a choice that was made because we chose to be happy, and sometimes happiness doesn't exist within that arrangement anymore.
When it comes to celebrity love triangles, there are few more famous than Brad Pitt, Jennifer Aniston, and Angelina Jolie.More news: Sen. Elizabeth Warren Officially Kicks Off Bid for White House