25. Christina Hendricks
Biggest accomplishment this year: Taking the lead role in Ryan Gosling's directorial debut, How to Catch a Monster
On Mad Men, Christina Hendricks plays Joan Harris, the only female partner at the SCDP. The show's sixth season, airing now, hasn't given us enough of Harris, who's one of the most complex, sympathetic figures in the office. Thankfully, she'll play the lead in Ryan Gosling's How to Catch a Monster, where she'll play a single mom who works at a fetish club.