Allo bebby pic.twitter.com/Ue8ckGnFiL
- Tina O'Brien (@tinaob) May 8, 2014
The beaming 30-year-old actress showed off her growing bump and gave the camera a thumbs up sign.
She simply captioned the shot: "Allo bebby."
Tina – who is expecting with her boyfriend Adam Crofts – told her fans how she's getting her exercise on Twitter.
She wrote: "Loved Zumba step today, I looked hilarious wiggling my big baby belly around #20weekspregnant"
The former Coronation Street star also asked fans for suggestion on how to handle some of her new dilemmas.
She tweeted: "Mini dilemma I my mini car but going to struggle to fit a pram in boot. Any suggestions mum n dads? And is it true @Bugaboo bee + fits?"
Tina already has five-year-old daughter, Scarlett, with former Coronation Street co-star Ryan Thomas, and admitted she was looking forward to giving her little girl a baby brother or sister.
She tweeted: "Thanks for your lovely comments we are so happy! Can't wait to have a little brother or sister for Scarlett to boss around."
Posting a shot of an ultrasound scan on her Twitter page in early April, she said: "So @adstraining85 and I have some lovely news....."