Hilary Swank is so tough that she used to beat up "Karate Kid" star Ralph Macchio, he has claimed.

The femalefirst portal quoted Macchio, 43, as saying: "Hilary ... can kick butt. She's an athlete, she has strength, serious fighting skills, is surprisingly large and dresses in a way that hides how big she really is."

Meanwhile, Swank recently revealed that the intensive training regime for her Oscar-winning role in the boxing movie "Million Dollar Baby" left her with a terrible breath.

Seeing that her husband, Chad Lowe, had to put up with her rancid mouth, she said: "I have to admit he didn't find the halitosis easy to live with. All that protein gave me the worst donkey breath."