The former Girls Aloud band member tweeted the news this morning and said: "Yes it true I'm joining Corrie! As u all know I've been a huge fan for yrs now so can't wait to strut my stuff on those famous cobbles!"
Sarah, who was born in Ascot but raised in Manchester, was a member of top girl band Girls Aloud for ten years but this is not her first time in front of the camera - she has had roles in BBC dramas and St Trinians 2: The Legend of Fritton's Gold.
Producer Stuart Blackburn said: "Sarah is proving to be a gifted and exciting actor and I'm absolutely delighted to have her on board, the viewers are in for a treat as her character will be right at the heart of a massive new story for the Barlows."
Filming will start in May.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here