Zoe Saldana

Zoe Saldana broke on to the scene by kicking human butt as a computer generated alien in the massive '09 hit Avatar. Although she's now in high demand, Saldana hasn't forgotten how beat people up. Whether it's matching punches with Jeffrey Dean Morgan in The Losers or picking off bad guys assassin-style in Colombiana, Zoe Saldana might be the toughest chick on-screen today.