The 33-year-old American Sniper actress will join the production on February 17 after Emma takes her last bow on February 15, a rep for the production confirms to JustJared.com.
This is not Sienna‘s Broadway debut, however. She appeared in the 2009 production of After Miss Julie, another production with the Roundabout Theatre Company.
Sienna currently can be seen in American Sniper and Foxcatcher, which are both playing in theaters around the country.
Emma just happened to extend her Cabaret contract for two additional weeks. Be sure to see both ladies in the show if you’re able!