Brad Pitt wasn't the only ex there! Jennifer Aniston 'also mingled with John ...

That sure was one crowded roomy at Jennifer Aniston's 50th birthday party held inside the Sunset Tower hotel in West on Saturday evening.

Not only was Jennifer Aniston's ex-husband Brad Pitt there. But so was her ex-boyfriend John Mayer, according to People.

At to make it even more interesting, Mayer's old flame Katy Perry was also in attendance with current beau Orlando Bloom.

Popular lady: That sure was one crowded roomy at Jennifer Aniston's 50th birthday party held inside the Sunset Tower hotel in West Hollywood on Saturday evening. Not only was Jennifer Aniston's ex-husband Brad Pitt there. But so was her ex-boyfriend John Mayer. Seen in 2009

Popular lady: That sure was one crowded roomy at Jennifer Aniston's 50th birthday party held inside the Sunset Tower hotel in West on Saturday evening. Not only was Jennifer Aniston's ex-husband Brad Pitt there. But so was her ex-boyfriend John Mayer. Seen in 2009

Drama: At to make it even more interesting, Mayer's old flame Katy Perry was also in attendance. Seen in 2014

Drama: At to make it even more interesting, Mayer's old flame Katy Perry was also in attendance. Seen in 2014

Jen was married to Brad from 2000 until 2005. And she romance Mayer from 2008 until 2010.

Katy was with John from 2012 until 2014. She has been dating Bloom since January 2016.

'The important people in her life gathered to celebrate with her,' the insider says. 'Brad fits into that group, and it was natural that he would want to come.'

She has certainly moved on: But the Roar singer was with her current beau Orlando Bloom; seen in September in Monte Carlo

She has certainly moved on: But the Roar singer was with her current beau Orlando Bloom; seen in September in Monte Carlo

And it seems Mayer, who Jen has not been pictured with in years, also is on good terms with the Friends vet. 

Also at the party were , Reese Witherspoon, Kate Hudson, Demi Moore, Robert Downey Jr., Jason Bateman, Courteney Cox, Lisa Kudrow, Barbra Streisand and Pitt’s ex-fiancee, Gwyneth Paltrow. 

As far as Jen and Brad, there is no romance. 

Entertainment Tonight claims the two 'hugged and briefly talked,' but the Once Upon A Time In actor spent most of his time chatting up his Ocean's 11 co-star George Clooney. 

The way they were: Brad and Jen were married from 2000 to 2005; seen here in 2004

The way they were: Brad and Jen were married from 2000 to 2005; seen here in 2004

Brad, who is in the process of divorcing Angelina Jolie, 'wanted to support' Aniston because the former couple have 'been friendly' in recent years said 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,' the site alleged.

Though 'they didn’t have much interaction at the event,' he was seen hugging her. 

It was added that Pitt 'did not stay at the bash the entire night.'

They had a ball: Also there was Brad's ex-fiancee Gwyneth Paltrow who has become close friends with Jennifer

They had a ball: Also there was Brad's ex-fiancee Gwyneth Paltrow who has become close friends with Jennifer

So many friends! She also posed with Reese Witherspoon and Jennifer Meyer, among others

So many friends! She also posed with Reese Witherspoon and Jennifer Meyer, among others

'He came to

read more from dailymail.....

Get the latest news delivered to your inbox

Follow us on social media networks

PREV Married At First Sight's Sam Ball buys flowers for ex Akila Ahmunett
NEXT Luke Jacobz says Justin Lacko is 'blocking' their I'm A Celebrity co-stars on ...