Brad Pitt was the first person to arrive at Jennifer Aniston's Christmas party on Saturday, Dec. 14. The Ad Astra actor was also one of the last ones to leave among the guests that included about 50 of Aniston's famous friends. 

Eyewitnesses told Entertainment Tonight that Pitt arrived at Aniston's Bel-Air home at around 7:00 p.m. and said goodbye at about 11:00 p.m. The actor was dressed casually with his cap on and a bomber jacket. He came with his bodyguard in tow.  

Aniston's house was "tastefully decorated" with string lights on her trees. The mood around the party was festive but low-key and pretty casual.  Also at the party were Pitt's former flame Gwyneth Paltrow, whom he dated in the early '90s before he met his first wife. Lisa Kudrow, Aniston's co-star on Friends, as well as Tom Hanks and his wife Rita Wilson were also at the joyous event.

Representatives of the couple, however, said that Pitt and Aniston are not back together even if they are both single. There is nothing romantic going on between the former couple. 

According to a source, Pitt and Aniston are have been speaking with each other a few times since being single. Before that, Pitt and Aniston were in touch through text messages only and would congratulate each other if they had projects or event.

In May, members of the paparazzi asked Pitt if he was dating Aniston again. The actor simply responded with an "Oh, my God" and laughed off the question. 

In February 2019, Pitt was also at Aniston's 50th birthday party at the Sunset Tower Hotel in Los Angeles. According to People, the actor arrived at the bash wearing a cap and casually entered the premises. Incidentally, Paltrow, who is now engaged to Brad Falchuck, was also at her friend's birthday bash. 

Pitt ended his 12-year relationship with his second wife Angelina Jolie in 2016. A year later, Aniston and her husband Justin Theroux also filed for divorce.

Pitt and Aniston were married from 2000 to 2005. Soon after, Pitt was in a relationship with Jolie, with whom he had six children. 

In January 2020, Pitt and Aniston will once again be reunited at the Golden Globes ceremony as both stars are nominated. Aniston is vying for Best Actress for her TV series The Morning Show. Pitt is also nominated for the movie Once Upon a Time in Hollywood.