The Hollywood actress was practising for her role in new movie How Do You Know last year (09) by playing a game of softball at home with her family and friends.
But the game ended in agony for Witherspoon after she was hit in the face with the ball.
The Legally Blonde star fell to the ground and was left covered in blood, much to the horror of her daughter, Ava, and son, Deacon, who both witnessed the shocking injury.
Witherspoon tells Access Hollywood, ""I got popped in the eye. I got a black eye. Oh, I got a bloody nose... I was just practising at home with friends and stuff and I just, you know, throw to keep my arm in shape and stuff...
""They (my kids) were there when I got it and I hit the ground - that freaked them out little bit.""
But Witherspoon admits her kids later felt proud of their mum's wounds, adding: ""They thought it was cool. It's like I'm the only mom at school with a black eye!""