Kidman interjected, saying: “I hate how you call her Dern though!”
When Witherspoon asked why, the Aussie legend responded: “Because it sounds weird!”
The Legally Blonde star then confirmed why she refers to her co-star by her last name rather than her first.
“Do you know why? Because my name is Laura and her name is Laura and it’s confusing to me,” Witherspoon said, whose full name is Laura Jeanne Reese Witherspoon.
It appears Kidman herself had forgotten the star’s real name, as she responded: “Oh! That’s right.”
Witherspoon added: “So I get confused and just call her Dern. We can’t both be Laura.”
Reese is the star’s mother’s maiden name, which she took on at the beginning of her acting career.
Did you know Reese Witherspoon’s real name? Let us know in the comments.