Fisher was seen holidaying in Mexico's Cabo San Lucas with fiance Sasha Baron Cohen, of Borat and Ali G fame.
While the couple have kept quiet on pregnancy rumours for months, word of an impending birth gathered pace during this week's MTV Music Awards.
A British newspaper said the couple revealed the good news to friends at hip los Angeles pub the Cat and Fiddle.
The Daily Star quoted a source as saying: "Isla called everyone to a toast and gushed, 'We have got good news. I am pregnant'."
Representatives for the 31-year-old redhead have repeatedly defused rumours and have told the media, "If or when Isla becomes pregnant, she and her fiance will decide if an announcement is necessary."
The couple have yet to set a date for their wedding.Celebs and Bubs
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