Zellweger won the Oscar last year for best supporting actress in the movie Cold Mountain.
Charlize Theron won for best actress for 2003, for her performance in Monster.
The Oscars will be held on February 27 in Hollywood.
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Renee Zellweger and Charlize Theron at the Oscars
Actresses Renee Zellweger and Charlize Theron have confirmed that they will be presenting at the Oscars.