The 32-year-old actress made the announcement on Twitter and said the baby is due in the summer.
Natalie Cassidy (Anthony Devlin/PA Wire)
She wrote: “Evening all… Time to let everybody know that @cameramarc and I are having a baby in the summer. The three musketeers become four.”
Natalie has a five-year-old daughter called Eliza from a previous relationship.
Natalie is currently on TV in EastEnders as Sonia Fowler, who is in a relationship with Tina Carter (Luisa Bradshaw-White).
Her pregnancy will mean an exit for Sonia… Whether or not that’s permanent – and with or without Tina – remains to be seen.