For more than two decades, the show has been tracing the story of Peppa Pig, who is aged four and lives with Daddy Pig, Mummy Pig and her little two-year-old brother George.
Mummy Pig's pregnancy announcement on the show will be during the final episode of the current series of Peppa Pig, which will air on 30 March, coinciding with Mother's Day.
Peppa Pig is due to have another sibling soon as Mummy Pig is pregnant for the third time, it's been announced.
The animated hit show will soon be having another character on the set as Mummy Pig said she was "completely delighted" about having another baby.
The voice of the character of Mummy Pig told ITV's Good Morning Britain: "I'm excited to share that our family is getting even bigger because we're having another baby.