Of course she secretly has a double name.

Rodin Eckenroth/FilmMagic

Well, consider us flabbergasted.

TheLouisiana-born actressactually has a very different legal name.

Reese Witherspoon

Credit:Rodin Eckenroth/FilmMagic

And its adouble name, to boot!

The topic of monikers came up in a recentVanity Fairconversation between Witherspoon andNicole Kidman.

Kidman, however, wasnt a fan.

I hate how you call her Dern, though.

It sounds weird, she told Wiltherspoon.

Im always like, Laura.

And youre like, No, Dern.

But Witherspoon had her reasons.

Im going to tell you why, she told her friend and co-star.

My names Laura and her names Laura, and its confusing to me.

My real names Laura Jeanne.

I get confused, so I just call her Dern.

Reese is her mother Bettys maiden name.

Witherspoon opted to use it instead of Laura or Laura Jeanne when she began acting in the early 90s.

The more you know!