The pair announced the happy news with a shot of her stunning engagement ring on the cover of this week's OK! magazine, and even included some details of the incredibly romantic proposal story.
Tina and Adam, who have a son - two-year-old Beau - together, as well as Sarah's nine-year-old daughter Scarlett from her previous relationship with Corrie actor Ryan Thomas, live together in Manchester. And it's in a hotel room in Manchester where Adam popped the question to his actress girlfriend.
Tina, 32, who is best known for her role as Sarah-Louise Platt in Corrie, told OK! magazine how surprised she was when Adam got down on one knee at the Didsbury House boutique hotel.
'My heart was hammering, I opened the door and Adam was standing there in his shirt and all smartly dressed. There were candles all around the room and flowers and petals on the bed in the shape of a heart.
'He immediately got down on one knee and asked me to marry him. He said lots of lovely words but I can't remember any of them.'
Although it was nothing but romantic for Tina, it seems her business development manager boyfriend had some pre-proposal nerves, even describing his elaborate proposal as 'quite scary'.
Adam explained that he wasn't even totally sure Tina was going to say yes – even though they'd already talked about getting married.
'You never know, do you? You sort of assume she will [say yes] but you're like, hang on a minute, what if it's a no? So there's that panic. It was actually quite scary', he said.
Tina with her previous partner and Corrie co-star, Ryan Thomas
The couple plan to get married in August this year or next year, and it seems as though the big day can't come soon enough for mum-of-two Tina. 'I would literally get married tomorrow. I can't wait to get married to Adam, but there's a part of me that goes "I want my big day!"'
We can't wait to see this soap wedding - congratulations both!
Read the full story in this week's OK! Magazine - out today.