JEN ANISTON COLLAPSES!

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Jennifer Aniston suffered a terrifying collapse on the set of her latest film – a chilling wake-up call that the thin, exhausted actress needs to slow down, say pals.

The 40-year-old former Friends star has been putting in 14-hour workdays since late March while shooting her latest movie, The Baster, in New York City.

During a grueling all-day outdoor shoot in May, Jennifer – who is both starring in and executive-producing the film – complained of being dehydrated and tired.

"She frantically yelled out, ‘I need a break!’ She said she felt dizzy and light-headed," said a friend. "She’s usually so calm.

"She rushed to her trailer to rest and collect herself, but she lost her balance and nearly keeled over."

Fortunately, an assistant raced to Jen’s aid, kept her from hitting the ground and helped her regain her balance.

But the frightening collapse "really shook Jen up," divulged the friend. "It was a wake-up call that she needs to slow down."

Her frantic work schedule, stress over her split from John Mayer and disappointing reviews and box-office returns for her last film release, Management, have left Jennifer at her breaking point.

"Jen is running on fumes and her nerves are frayed," a longtime friend told The ENQUIRER. "She hasn’t been taking great care of herself physically, and it finally caught up with her.

""She’s upset that she’s 40 and all alone. Her love life is definitely causing her sleepless nights and stress. Jen has been complaining to friends that she feels like she’s running on an endless treadmill and that she has zero social life."

 "The collapse was a warning sign that she needs to unplug," added the friend.