The two appeared on the Ellen DeGeneres show to talk about the incident.
They were filming a scene where Vergara was supposed to push Witherspoon and insisted Vergara "push her hard."
Vergara pushed and Witherspoon doubled over and ended up in the emergency room.
"I was like this in the sofa and I popped her ovary," said Vergara. "I pop her ovary."
"I thought my appendix had burst," admitted Witherspoon.