People: Jennifer Aniston of 'Friends' Fame Invited Ex-Husband Brad Pitt to Her Christmas Tree Trimming Party

Jennifer Aniston throws a star-studded event for her annual Christmas party and creates a media frenzy when her ex-husband, Brad Pitt is spotted entering the building.

On Saturday, Jennifer Aniston pulled out the stops to keep her star-studded annual Christmas tree trimming party under the radar. The event was manned by a huge security force. Security checks were even done to prevent guests from going on special media.

However, that didn't stop the prying eye of paparazzi cameras from spotting Brad Pitt when he entered the party.

According to PEOPLE, it is one of Aniston's favorite Christmas traditions. Some of her guests included Ellen DeGeneres, Gwyneth Paltrow, Jimmy Kimmel, and Kate Hudson.

The last time the former couple were in each other's company was in February when Pitt attended Aniston's 50th birthday party. A source tells the magazine they are "friendly" and have kept in touch.

Reports have noted that they keep their interactions at a minimum and appear to be cordial since their divorce in 2005, a sourced revealed:

"'There are truly no hard feelings between them...They both realize that anytime they cross paths people talk about a reunion. He came on his own and quietly entered the party."

It is inevitable that they will run into each other, especially since it is award season, and they are both up for awards at this year's Golden Globes.

Aniston is up for the Best Performance by an Actress in a Television Series Drama for the "Morning show." Pitt is up for Best Actor in a Supporting Role in Any Motion Picture for his role in "Once Upon a Time in Hollywood."

There has been a lot of speculation as to how to couple are going to handle their run-ins during the awards season. A source tells US Weekly:

"Jen and Brad are friends and occasionally connect. There's no chance that a potential run-in between Jen and Brad will be tense or uncomfortable."

One of the most memorable times

attended the Golden Globe awards was in 2002, when they arrived in matching black suits. Cameras are on alert to catch a glimpse of their interaction this year.

There has been no evidence that they are not romantically linked again. Since her divorce from Justin Theroux, she said that she is "open" to love and still considers is to be a beautiful thing.