The actress and her partner Tom Pitfield welcomed little Alfie James last month.
Now the Corrie star has shared a snap of her 'little pickle' on Twitter, writing: "So proud of our Alfie : - ) our first family shoot out today in @OK_magazine #littlepickle."
Catherine's pregnant co-star Samia Ghadie tweeted:
Last month Catherine announced the news she'd given birth on the social networking site: "We made a wish and you came true. Welcome Alfie James Pitfield. We love you beyond words @TP_PTfitness #Besotted."
Her partner Tom also tweeted:"Welcome to the world Son. Alfie James Pitfield. @Cath_Tyldesley you made the happiest man in the world. Thank you x"
The actress, who plays Eva Price on the long-running soap, announced she was pregnant with her first child with Tom in October last year.
She told Hello! magazine: "I feel strongly being a mother is something I am supposed to do."
The actress had previously revealed that her Corrie co-star Antony Cotton, who plays Sean Tully, would be her stand-in birthing partner, along with his boyfriend Peter Eccleson.
Antony had said: "Me and Peter are going to be like armed guards at either side of the door when she pushed."
"We're on stand-by just in case Tom faints."
Anthony was quick to send congratulations following the birth and wrote: "Finally! Welcome to the world Alfie James Pitfield! He's a bruiser @Cath_Tyldesley @TP_PTfitness xxx"
Catherine had also revealed that she had been planning to have self-hypnosis to ease her through labour, inspired by Kate Middleton, with the help of hypnobirth expert Cheryl MacDonald.
Catherine said: "I was lucky enough to enjoy a session this week.
"One of the most important things for me as an expectant mother is lowering stress levels.
"Hypnobirthing is much more than simply self hypnosis or hypnotherapy for childbirth.
"You discover that severe pain does not have to be an accompaniment of labour. Practitioners help mums to-be learn how to release the fears and anxieties we may currently have about giving birth.
"It focuses on the joy and magic of birth – rather than the horrific ordeal everyone else seems hell-bent on telling you about."