Famous faces spotted arriving at the party in West Hollywood's Sunset Tower included Amal and George Clooney, Reese Witherspoon, Katy Perry and Orlando Bloom, Sandra Bullock, Ellen DeGeneres, Gwyneth Paltrow, Cindy Crawford, and according to the Daily Mail, ex-husband Brad Pitt.
"I'm just going to go. eat her food and drink her wine and say 'Happy Birthday!'"
"Love these ladies", Hudson wrote.
Jennifer, who split from Justin Theroux in 2017 after two years of marriage, recently opened up about her past relationships, and insisted she would never stay in a troubled marriage for fear of being alone.
She discussed inviting him with friends and ended up "very happy" when he attended.
"For well over a decade now they have lived totally separate lives and so not surprisingly, they have become totally different people than who they once were when they were together", said the source.
She certainly wasn't alone when she left last night's party - the star was surrounded by pals.
Meanwhile, Aniston's other ex, John Mayer, was in attendance, as was his ex, Katy Perry.
Jennifer did indeed look fire as she invited the elite of Hollywood to join her in celebrating her big birthday.
The former couple, who were married for five years before splitting in 2005, have remained friendly since their divorce, and have grown closer after Brad separated from his second wife Angelina Jolie in 2016.
"My marriages, they've been very successful, in personal opinion". Pitt then went on to marry Angelina Jolie, while Aniston Wednesday Justin Theroux.
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