A who's who of Hollywood was in attendance, including a surprising appearance by her ex-husband, Brad Pitt, as well as George and Amal Clooney, Reese Witherspoon, Robert Downey Jr., Ellen DeGeneres, Katy Perry and more.
The source continued, "Brad, for long, was a very important part of Jen's life".
However, a source said: "They aren't in regular contact, beyond an occasional text back and forth to wish each other the best when there's been a new project or big event".
"I'm just going to go. eat her food and drink her wine and say 'Happy Birthday!'"
A few of Aniston's friends gave a glimpse inside the party, thanks to a fun photo booth set up inside. "They hugged and chatted for a bit, but Jen was busy making sure all of her other guests had an unbelievable time".
The photos showed a smiling Jen at the centre of a group which included Gwyneth Paltrow, Orlando Bloom, Katy Perry and Courteney Cox.
Would you believe us if we told you February 7, 2019 marks Jennifer Aniston's 50th birthday?
Earlier in the evening, Jennifer, who turns 50 on Monday, stunned in a strappy black jumpsuit and heels as she entered the historic hotel, which is reportedly her favourite Hollywood hotspot.
Jennifer Aniston's birthday celebration was quite the A-list affair.
'Love these ladies, ' Hudson wrote on Instagram. "We all love you sooo!" I really don't. My marriages, they've been very successful, in [my] personal opinion.
As you may know, Brad and Jen got married back in 2000 and split five years later, and ever since they both became single again, many shippers have been dreaming of a reconciliation. Fear of being alone.
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. Those were never my fantasies.
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