The only actress who was pregnant during the filming of Friends was Lisa Kudrow, who played Phoebe Buffay. She was pregnant with her son, Julian Murray Stern, during the filming of the show's fourth season.
While Kudrow's pregnancy was written into the storyline, the other actresses on the show were not pregnant during the filming of Friends.
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Courteney Cox was pregnant with her daughter, Coco Arquette, during the filming of the show's sixth season, but Friends was already in production when she conceived. The show's creators chose not to write Cox's pregnancy into the storyline, but she was able to conceal her pregnancy with loose-fitting clothing and strategic camera angles.
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Jennifer Aniston was married to Brad Pitt during the show's run, but she was not pregnant during that time.
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Matt LeBlanc, Matthew Perry, and David Schwimmer were all single during the show's run and did not have children.
While there were no other pregnancies among the main cast, there were several instances of guest stars being pregnant during filming. Some of these pregnancies were written into the storyline, while others were not.