Jennifer Aniston's Private Plane Makes Emergency Landing En Route to 50th Birthday in Mexico: Source

Alexia Fernandez

Jennifer Aniston‘s 50th birthday celebrations came to a halt when her private plane was forced to make an emergency landing on Friday.

The actress was headed to Cabo San Lucas, Mexico when her plane circled back and landed at the Ontario International Airport in Ontario, California, a source tells PEOPLE.

The airport was closed down so the plane could land, according to the source. The actress and her friends will wait for a new plane at the airport and continue on their trip to Cabo San Lucas, the source added.

An initial tweet by the Ontario International Airport read, “ALERT: ONT and the City of Ontario Police and Fire Departments are currently on alert for an incoming aircraft. More information to follow.”

It was followed by a second tweet, saying, “FINAL UPDATE: Incoming aircraft, Gulfstream – N729TY, landed safely at ONT. OPD and OFD are on the scene.”

In a statement released shortly after, it was revealed there were problems with the plane’s landing gear.

“A Gulfstream aircraft with 10 passengers and two flight crew members on board landed without incident at Ontario International Airport (ONT) after experiencing landing gear difficulty,” the statement read.

RELATED: Brad Pitt Sent Jennifer Aniston a Gift Before Her 50th Birthday Party: Source

“The plane was en route Friday from Los Angeles International Airport to Cabo San Lucas when it was discovered that one of the four rear tired had displaced,” it continued. “The aircraft landed safely at ONT around 2 p.m. Friday.”

The news comes almost a week after the Friends actress celebrated her birthday among her pals including Courteney Cox, Gwyneth Paltrow, Kate Hudson, 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 told PEOPLE. “The party was a celebration of Jen’s life.”

RELATED VIDEO: Jennifer Aniston Feels ‘Fantastic’ Before 50th Birthday, Thanks to Boxing with Her ‘Gentle Giant’

“Brad, for long, was a very important part of Jen’s life. She debated back and forth with friends if she should invite him,” added 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.”

Another of Aniston’s previous loves, ex-husband Justin Theroux, couldn’t make it to the party but shared a sweet photo of the actress on Instagram to commemorate her birthday.

Happy Birthday to this fierce Woman,” he wrote in the caption. “Fiercely loving. Fiercely kind. ….and fiercely funny. ?? you B.”