The actress has taken on the role of Naomi, who is the latest girlfriend of returning character David Wicks (Michael French).
Naomi will feature in one episode of the BBC show in September, making her way to Walford with David when he returns to the area.
An EastEnders statement teased: "Viewers won't be surprised to see the lothario with a woman in tow, however things aren't quite what they seem when the past quickly catches up with them."
Further details of the storyline have yet to be revealed, but Naomi will be featuring in scenes with David, Carol Jackson (Lindsey Coulson) and Masood Ahmed (Nitin Ganatra).
Speaking of her role, Maxwell commented: "I've had a fantastic time filming at EastEnders and working with the wonderful Michael, Lindsey and Nitin has been an absolute joy.
"I can honestly say it's one of the happiest jobs I've done. Michael French is an amazing actor and to be part of such an iconic character's return to the Square felt very special."
Maxwell is best known for her role as DI Sam Nixon in The Bill. She has also been a regular panellist on ITV's Loose Women since 2009.
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