The soap hunk, 32, shared the happy news with his Twitter followers on Friday (30 January).
Alongside a picture of himself and model Kit with huge smiles, James simply wrote: "She said yes."
In the snap, the loved-up pair seem to be celebrating their good news with a few drinkies on a veranda overlooking a beach - how romantic!
James - who plays John Paul McQueen in the C4 soap - chose to propose to his stunning girlfriend while they enjoyed a sun-soaked holiday in Barbados.
After announcing the exciting news, James' co-stars were keen to send their messages of congratulations.
Kirsty-Leigh Porter wrote: "Oh mate... Huge congratulations! You've broken my little cold heart Feel like a proud mum. Love to you both!"
Jessica Fox added: "Congratulations guys!! How exciting!! Xxx."
Gemma Bissix gushed: "OMG. This has just made my year! I can't stop smiling! Huge congrats to u both! U two r truly made for each other!! xx"
She said yes. pic.twitter.com/7uheTOfbuo— James Sutton (@thejamessutton) January 30, 2015
The next day, James thanked everyone for their messages, writing: "Thanks for all the congratulations messages on our engagement and the birthday ones too. I'm having a great birthday."
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