Former 'Friends' star, Jennifer Aniston, fainted on the "Break Up" set, after complaining of nausea and severe headaches.
Jennifer was officially diagnosed with heatstroke, after she collapsed during the shooting in Chicago, Illinois.

It seems that all the fuzzing around ex-husband Brad Pitt and Angelina Jolie affected Jennifer more then she has expected to.

Apparently, Jennifer Aniston was crushed after she has seen the pictures from People magazine with Brad Pitt and Angelina Jolie acting like a loving family, according to Britain's Daily Star .

Jennifer "freaked out" when she heard that her ex-husband is going to have a child with Angelina, as well.
She was also disturbed by Brad's trip in Ethiopia with Angelina Jolie to addopt a baby girl.

Aniston asked paparazzi on several occasions to leave her alone and respect her privacy, arguing she's going to have a nervous break down if the snappers won't stop following her.

During the past weeks, rumors about Angelina's romance with Brad Pitt were published by most of the magazines and newspapers from all around the globe.

Some even said that the couple is expecting a child and they intend to officially become a family, after Brad's divorce.

An insider told the British newspaper Daily Mail: "She's been walking around with a sad look on her face and has not been her usual self. While her collapse was blamed on heatstroke, everyone thinks it's more down to stress than anything else.

"She can't have escaped all the stories about Brad and Angelina and it looks like the situation has taken its toll on her."