Kate Hudson, Gwyneth Paltrow and More Get Silly with Jennifer Aniston at Her 50th Birthday Party

Jennifer Aniston is loved by her millions of fans — as well as her dear friends.

The star, who turns 50 on Monday, celebrated her milestone birthday on Saturday with a big bash held at the Sunset Tower Hotel in Los Angeles — and the following day, her friends began sharing their own sweet and silly snaps from the star-studded fête.

“Love these ladies,” Kate Hudson wrote alongside a photo booth GIF of herself, Aniston and Gwyneth Paltrow smiling and goofing off for the camera.

“Celebrated this beauty last night,” Hudson, 39, added. “Happy Bday JA! We all love you sooo!”

Hinting that there had been a rule against sharing images from the bash, fellow party guest Katy Perry commented on the post, jokingly writing, “NO SOCIAL MEDIA.”

In her own post, Paltrow, 46, praised her friend, calling her a “ray of sunshine” and an “example of perpetual goodness.”

“Happy birthday (last night and tomorrow) to #jenniferaniston our ray of sunshine, example of perpetual goodness. We love you so much and you make 50 LOOK 🔥,” she wrote alongside another photo booth GIF.

Longtime Aniston pal Jennifer Meyer also shared a series of images from the evening, writing, “Last night celebrating our beautiful Jen ❤️❤️ WE ALL LOVE YOU SO MUCH 💘💘💘

Derek Blasberg, head of YouTube’s Fashion and Beauty Partnerships division, went on to share his own series of photobooth snaps, in which Courteney Cox, Perry and the singer’s boyfriend Orlando Bloom could also be seen posing with the woman of the hour.

“There were old friends and new friends and actual Friends and everyone was overjoyed to celebrate this perpetual ray of sunshine: Happy birthday, Jen!” he captioned the images.

Also in attendance were George and Amal Clooney, Reese Witherspoon, Robert Downey Jr., Ellen DeGeneres, Barbra Streisand, Keith Richards, Laura Dern, Demi Moore and Lisa Kudrow — as well as Aniston’s ex-husband Brad Pitt.

“Basically, every single person who Jen loves attended. That included Brad,” a source tells PEOPLE. “The party was a celebration of Jen’s life.”

“Brad, for long, was a very important part of Jen’s life. She debated back and forth with friends if she should invite him,” adds the insider. “She was very happy that he showed up. Many of his close friends were at the party too.”

Even though Aniston invited her ex-husband, 55, to the bash, she “didn’t really pay any special attention to Brad,” the source explains, adding that “Jen was busy making sure all of her other guests had an amazing time.”

RELATED VIDEO: Jennifer Aniston Says Her Marriages to Brad Pitt and Justin Theroux Were ‘Very Successful’

Following the news of Aniston and ex-husband Justin Theroux‘s split in February 2018, a source with knowledge of Pitt and Aniston’s relationship told PEOPLE the stars — who were married from 2000 to 2005 — had “been over each other for longer than they were ever together.”

While Aniston and Pitt had remained friendly over the years, the source said the two weren’t especially close. “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,” the insider said at the time.