Jennifer Aniston has uncovered a big little lie about Reese Witherspoon .

After more than two decades of friendship , the 56-year-old finally learned that her The Morning Show costar's real name is not Reese , but rather Laura.

And her reaction? A hilariously baffled response of: "Who the hell's Laura?"

"I'm Laura Jean," Reese, 49, told the Friends alum during a joint interview with LADbible published Sept. 16. "That's my real name."

Still perplexed, Jennifer asked her longtime friend, "What made you go with Reese for your acting name?"

The Legally Blonde star then explained that she "didn't change" her name, but that her name was "always Reese" since it's her mom Mary Elizabeth "Betty" Witherspoon 's maiden name.

"It's my middle name," she added. "I'm Laura Jea

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