She shared her love for Aniston on Instagram today, January 11, with pictures of her, Kate Hudson and Aniston from the party. "We love you so much and you make 50 LOOK [fire emoji]", she wrote in the caption.
She discussed inviting him with friends and ended up "very happy" when he attended.
She certainly wasn't alone when she left last night's party - the star was surrounded by pals. A source told PEOPLE that they are not especially close, but they are friendly, and they had "been over each other for longer than they were ever together".
It is believed she ducked out of her birthday bash at around 1am in the morning.
Aniston marked her 50th birthday with a party at the Sunset Tower Hotel in Los Angeles on Saturday, with ex-husband Brad Pitt in attendance, according to People magazine.
After several years of being celebrated as one of Hollywood's most glamorous couples, Jennifer and Brad shocked fans when they announced that they were divorcing in 2005.
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Among the big names were Ellen DeGeneres, George and Amal Clooney, Orlando Bloom and Katy Perry, along with Reese Witherspoon, who partied until she literally fell down.
Speaking to The New York Times, Theroux revealed that it was "the most gentle separation, in that there was no animosity". "I really don't", she said.
"I don't feel a void". Pitt then went on to marry Angelina Jolie, while Aniston Wednesday Justin Theroux.
"My marriages, they've been very successful, in personal opinion. And when they came to an end, it was a choice that was made because we chose to be happy, and sometimes happiness doesn't exist within that arrangement anymore", she explained.
Despite various reports about whether Pitt and Aniston are still friends, his appearance at her party put the rumours to bed once and for all.