The blonde actress, who shot to fame as Becca on the Channel 4 soap, shared her exciting news with fans via Twitter after boyfriend Tom popped the question during a romantic holiday abroad.
Ali wrote: "Earlier this summer, on our holiday in Greece, on a moon lit beach, my wonderful man @Tomclaymusic made me the happiest girl in the world, by getting down on one knee and asking me to marry him... I said yes!"
She also shared a picture of her beautiful engagement ring.
Following a string of congratulatory messages, she tweeted: "Thank you so much for your lovely messages. We're really touched by all your kind words."
After publicly announcing her engagement, Ali headed out for a girls' night with friends including former Hollyoaks co-star Sarah Jayne Dunn, who played Mandy.
Both Ali and Sarah shared several photos from their fun night out, with Sarah captioning one: "#oldfriends #becca #hollyoaksoldschool."
Since leaving Hollyoaks, 31-year-old Ali has starred in The Bill, several stage shows and appeared in Strictly Come Dancing.
Congrats to Ali and Tom!
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Copyright: Instagram Mark Wright