Christina Applegate took the expression "break a leg" a little too literally. The star of the Broadway-bound revival of Sweet Charity broke her foot during a performance in Chicago, forcing her to sit out the musical's Boston engagement, which kicks off Friday. Applegate is expected to return to the show in time for its New York debut on April 4. In the meantime, Applegate is asking folks to simply wish her "good luck" in the future.