The former spouses were reunited over the weekend, when Pitt attended Aniston’s 50th birthday party at the Sunset Tower in Los Angeles, California.
A source tells ET that Pitt “wanted to support” Aniston because the former couple have “been friendly” in the years following their split.
According to the source, Aniston put her ex-husband on her invite list weeks ago and Pitt was in town and happily chose to attend to help her celebrate the milestone birthday.
Though he was at the party, Pitt and Aniston didn’t have much interaction at the event. They were, however, seen briefly talking and exchanging a hug. The source adds that Pitt did not stay at the bash the entire night.
“He came to support her, spoke to other friends of his that were there and headed out,” the source notes.
Another source tells ET that Pitt was "having a great time" and spent most of the night hanging out with George Clooney and Orlando Bloom.
The father of six went to great lengths not to be seen leaving the party, and hotel staffers and security helped make it difficult for him to be photographed.
A source adds, "Jen and Brad have remained friends and have spoken with each other quite a few times since they both became single. They are friends and have supported each other through some tough times. They've come so far since their marriage and plan to stay friends for life. There are truly no hard feelings between them... They both realize that anytime they cross paths people talk about a reunion. He came on his own and quietly entered the party. They had heavy security, kept a ban on social media, and hoped for the best."