As for why Pitt, 55, received an invitation to the actress' 50th birthday bash at the famed Sunset Tower Hotel in Los Angeles, the source explains, "Basically, every single person who loves Jen attended".
"Jen was the first guest to arrive around 8 p.m. wearing a black jumpsuit with her hair down", a source tells E! 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.
"Everyone was coming up to Jen and hugging her and screaming Happy Birthday".
"They hugged and chatted for a bit, but Jen was busy making sure all of her other guests had an awesome time", the source added.
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Jen teamed up with acting gal pals Kate Hudson and Gwyneth Paltrow for some animated snaps as they paid tribute to the "perpetual goddess" and "ray of sunshine".
"Love these ladies", Hudson wrote. Happy Bday JA! We all love you sooo!'
The medium said there were no reports of Pitt and Aniston mingling throughout the evening, though.
Brad and Jen were once Hollywood's darling couple but ended their marriage in 2005 after five years.
"I don't have time to get her a present".
Aniston went on to share that despite the fixation people have about her marital status, she's never placed a high priority on tying the knot. I really don't. My marriages, they've been very successful, in [my] personal opinion.