The Hollywood actress - whose marriage to the 'Inglourious Basterds' hunk ended in 2005 - was apparently so distraught about the romantic scenes with her 'The Bounty' co-star Gerard Butler, she fled to her trailer in tears.
She reportedly told her assistant: "I need a moment. This scene reminds me of Brad and me."
On set sources claim this wasn't a one-off incident and the 40-year-old actress - who has remained single since she was dumped by singer John Mayer earlier this year - was "very fragile" during the last few months of filming.
The source added to the New York Post newspaper: "While she enjoyed flirting with Gerard on set and put a brave face on every day, privately she is still very fragile."
During production, Jennifer was romantically linked with Gerard, 38, after they were seen holding hands while on a dinner date in New York.
When Jennifer and Brad's five-year union ended, there was speculation this was down to his growing closeness to his 'Mr. and Mrs. Smith' co-star Angelina Jolie - with whom he now raises six children.