"So I have some more exciting news......" Tweeted the 31-year-old. "... 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!!" added Chicago star Ali along with a photo of her glittering engagement ring.
CLICK ON PHOTO FOR FULL GALLERY
Ali's exciting news was greeted by a host of congratulations from her fans.
"Thank you so much for your lovely messages!!!!! Xxxxxx" Tweeted the bride-to-be.
Ali has previously been in a relationships with her Hollyoaks co-star Kevin Sacre and professional dancer Brian Fortuna, who was her partner in 2009's edition of Strictly Come Dancing.