The actress, who played Sarah-Louise Platt in the ITV show, uploaded a picture to Twitter on Thursday (8 May) showing her giving the thumbs up sign next to her burgeoning belly.
"Allo bebby," she added.
Tina's fans left congratulatory messages and plenty of compliments. "You look glowing, hunny," wrote one, while another said: "Yummy mummy!"
Actress Tina announced her second pregnancy in March, describing it as "lovely news" for herself and personal trainer boyfriend Adam Crofts.
She later added: "Thanks for your lovely comments. We are so happy! Can't wait to have a little brother or sister for Scarlett to boss around!"
Tina is also mum to daughter Scarlett, born in 2008, from her relationship with former Corrie co-star Ryan Thomas.
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Celebrities who announced pregnancies in 2014 in pictures:
Copyright: WENN Lexie Appleby/Future Image/Bridow/Instagram