The actor, who plays Steve McDonald in the ITV soap, announced the arrival of his third child via Twitter, saying he and wife Emma Gleave are delighted.
He wrote: "After talking 2 a belly for 9 months, I can now talk to a beautiful little face & know it's not Mr Hanky. Myself & @emmagleave are thrilled."
Simon and Emma are also parents to sons Alfie and Harry.
They announced in May that baby number three was on the way, sharing their news by the means of a photo showing Simon having a "beer" belly and Emma with a "baby" belly.
Congrats to Simon and Emma!