United Kingdom, Sept. 18 -- Jennifer Aniston was stunned to find out Reese Witherspoon's real name.

The 56-year-old actress has been friends with her Morning Show co-star for over two decades but she had no idea the Cruel Intentions star is really called Laura.

Playing a game of 'Do you even know me?' for LadBible, Jennifer incorrectly guessed Reese's middle name.

Her pal said: "It's Jeanne. I'm Laura Jeanne. That's my real name."

Visibly stunned, Jennifer replied: "What? Laura? What? Who's Laura? Who the Hell is Laura? Laura Jeanne, I'm not calling you that from now on, 'Come on, Laura Jeanne.' Where did Reese come from?"

Reese said: That's my middle name."

Jennifer marvelled: "Laura Jeanne Reese. What made you go with Reese for yo...