Sienna Guillory has confirmed her role in the upcoming Resident Evil: Retribution with these tweets today:

"Big day tomorrow! Meeting Paul W.S. Anderson and Jeremy Bolt and Robert Kultzer to see what my future looks like..." and "THANK YOU SO MUCH! RETRIBUTION HERE I COME!"
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The actress' role in Resident Evil: Retribution had been questioned when reports about her being replaced were released. This stirred up a lot of negative attention with the fans, who were hoping for her to return.

No details have been revealed about who will play newcomers Ada Wong, Leon Kennedy and Barry Burton.

Paul W.S. Anderson begins shooting Resident Evil: Retribution in September with Milla Jovovich returning as Alice.