The actress recently reprised her role as Shirley Carter's daughter Carly Wicks for two episodes, which are expected to air in September.
Although exact details of Carly's return storyline are currently being kept under wraps, it is understood that viewers will see her back in Walford to visit Shirley (Linda Henry) after the truth is finally revealed about Heather Trott's murder.
Speaking of her return appearance, Kellie Shirley commented: "Having left EastEnders in 2008, it's flattering to be asked to return as Carly for this particular storyline.
"Carly is coming back slightly older, wiser and independent, although she still needs and loves her mum. The Shirley/Carly dynamic is fun to play and is as volatile as ever."
She added: "I loved working with Linda, as well as Diane Parish and Steve McFadden again."
Carly has recently been mentioned on screen with the news that she has given birth. Although Shirley has tried to reach out to her daughter, she was rejected by her over the phone last month.
Further heartache lies ahead for Shirley in the coming days as she discovers that Ben Mitchell was responsible for Heather's death, leaving her with a big decision to make.
EastEnders is currently airing on BBC Two due to the Olympics, but is back on BBC One from August 13 in time for Sharon Watts's return and the dramatic conclusion to the Heather story. Get the Inside Soap magazine on your iPhone or iPad